Receivables related to gift card sales Accounts Receivable, after Allowance for Credit Loss, Gift Card Sales, Current Accounts Receivable, after Allowance for Credit Loss, Gift Card Sales, Current Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income (loss) Net income Net income (loss) Net Income (Loss) Attributable to Parent Entity Emerging Growth Company Entity Emerging Growth Company Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Number of Restaurants Number of Restaurants Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Accrued compensation and deferred payroll taxes Employee-related Liabilities, Current Deferred offering costs Deferred Offering Costs Income Statement Location [Axis] Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two COVID-19 Charge Type [Domain] COVID-19 Charge Type [Domain] COVID-19 Charge Type [Domain] Sales tax Sales and Excise Tax Payable, Current Revenue from Contract with Customer [Abstract] Payment contingent consideration liability Payment for Contingent Consideration Liability, Financing Activities Inventory obsolescence and spoilage Inventory Obsolescence And Spoilage [Member] Inventory Obsolescence And Spoilage Contract with Customer, Contract Asset, Contract Liability, and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Entity Filer Category Entity Filer Category Operating leases Operating Lease, Weighted Average Remaining Lease Term Initial fees Initial Fees [Member] Initial Fees Other long-term assets Other Assets, Noncurrent Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Proceeds from issuance of long-term debt Proceeds from Issuance of Other Long-term Debt Net increase in cash and cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Franchisor Disclosure [Line Items] Franchisor Disclosure [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Subsequent Event Type [Domain] Subsequent Event Type [Domain] Credit card fees Accrued Credit Card Fees, Current Accrued Credit Card Fees, Current Organization, Consolidation and Presentation of Financial Statements [Abstract] Financing obligations Financing Obligations [Member] Financing Obligations Variable lease expense Variable Lease, Cost Long-term debt, net Long-term Debt and Lease Obligation Time-based option awards outstanding not included in diluted net income (loss) per common share as their effect is anti-dilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Operating leases Operating Lease, Weighted Average Discount Rate, Percent Sale of Stock [Axis] Sale of Stock [Axis] Subsequent Events [Abstract] Stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Number of states where company operates and franchises restaurants Number of States in which Entity Operates Thereafter Lessee, Operating Lease, Liability, to be Paid, After Year Four Lessee, Operating Lease, Liability, to be Paid, After Year Four Title of Individual [Domain] Title of Individual [Domain] Other Debt Other Debt [Member] Other Debt Executed operating leases that have not commenced Lessee, Operating Lease, Lease Not yet Commenced, Liability Lessee, Operating Lease, Lease Not yet Commenced, Liability Award Type [Domain] Award Type [Domain] Other receivables Accounts Receivable, after Allowance for Credit Loss, Other, Current Accounts Receivable, after Allowance for Credit Loss, Other, Current Contingent rent Operating Leases, Contingent Rentals Operating Leases, Contingent Rentals Credit Facility [Domain] Credit Facility [Domain] Assets Assets [Abstract] Receivables from franchisees Accounts Receivable, after Allowance for Credit Loss, Franchise Receivables, Current Accounts Receivable, after Allowance for Credit Loss, Franchise Receivables, Current Leased assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Preferred stock; $0.01 par value; 266,667 shares authorized, issued and outstanding Preferred Stock, Value, Issued Senior Credit Facilities Senior Credit Facilities [Member] Senior Credit Facilities Entity Address, City or Town Entity Address, City or Town Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Accumulated Deficit Retained Earnings [Member] IPO IPO [Member] Debt Instrument [Axis] Debt Instrument [Axis] COVID-19 Charges Unusual or Infrequent Items, or Both, Disclosure [Text Block] Employee-related Liabilities Accrued Payroll Taxes, Noncurrent Accrued Payroll Taxes, Noncurrent Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Thereafter Finance Lease, Liability, to be Paid, After Year Four Finance Lease, Liability, to be Paid, After Year Four Secured Debt Secured Debt [Member] Accounts receivable Increase (Decrease) in Accounts Receivable Time-based option awards Time-Based Options [Member] Time-Based Options Change in liabilities from acquisition of property, fixtures and equipment Capital Expenditures Incurred but Not yet Paid Leased assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Annual vesting amount, percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Commitments and Contingencies Disclosure [Abstract] Finance lease payments Financing cash flows - finance leases Finance Lease, Principal Payments Entity Interactive Data Current Entity Interactive Data Current Contingent consideration liability, current Business Combination, Contingent Consideration, Liability, Current Net income (loss) per common share - basic (in dollars per share) Earnings Per Share, Basic Take-out sales Take-Out Sales [Member] Take-Out Sales 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Revenues Revenue from Contract with Customer [Text Block] Supplemental Information Related To Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Initial Delayed Draw Term Loan Initial Delayed Draw Term Loan [Member] Initial Delayed Draw Term Loan Document Type Document Type Prepaid expenses Prepaid Expense, Current Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Shares authorized for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Operating cash flows - operating leases Operating Lease, Payments First Amendment Delayed Draw First Amendment Delayed Draw [Member] First Amendment Delayed Draw Depreciation and amortization Other Depreciation and Amortization Long-term debt Long-term Debt, Gross Current portion of long-term debt Less: Current portion of long-term debt Long-term Debt and Lease Obligation, Current Plan Name [Axis] Plan Name [Axis] Finance lease assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Self-insurance and general liability reserves Accrued Insurance, Current Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Document Transition Report Document Transition Report Income Tax Disclosure [Abstract] Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] Franchisor Disclosure [Axis] Franchisor Disclosure [Axis] Total liabilities and equity Liabilities and Equity Other Other Accrued Liabilities, Current Applicable rate for additional interest, paid-in-kind Debt Instrument, Interest Rate, Paid In Kind Debt Instrument, Interest Rate, Paid In Kind Receivables from third-party delivery providers Accounts Receivable, after Allowance for Credit Loss, Third-Party Delivery Providers, Current Accounts Receivable, after Allowance for Credit Loss, Third-Party Delivery Providers, Current Vesting on first anniversary of initial public offering Share-based Payment Arrangement, Tranche One [Member] Deferred revenues Total current deferred revenues Contract with Customer, Liability, Current Scenario [Axis] Scenario [Axis] Additional paid-in capital Additional Paid in Capital Liabilities and Equity Liabilities and Equity [Abstract] Existing Credit Facility Existing Credit Facility [Member] Existing Credit Facility Accounts payable Increase (Decrease) in Accounts Payable Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Net Income (Loss) Per Common Share Earnings Per Share [Text Block] Minimum Minimum [Member] Nature of Business and Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Additional expected payments Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Gift card redemptions Contract with Customer, Liability, Gift Card Revenue, Revenue Recognized Contract with Customer, Liability, Gift Card Revenue, Revenue Recognized Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Occupancy expenses Cost, Overhead Leases Lessee, Finance Leases [Text Block] 2017 Options Plan 2017 Omnibus Equity Incentive Plan [Member] 2017 Omnibus Equity Incentive Plan Trading Symbol Trading Symbol Financing Agreement Financing Agreement [Member] Financing Agreement Current liabilities: Liabilities, Current [Abstract] Share issuance Stock Issued During Period, Value, New Issues Operating lease liabilities Increase (Decrease) in Operating Lease Liability General and administrative expenses General and Administrative Expense Debt Debt Disclosure [Text Block] Franchisor Disclosure [Domain] Franchisor Disclosure [Domain] Beginning Balance (in shares) Ending Balance (in shares) Shares, Outstanding Line of Credit Line of Credit [Member] Stock Based Compensation Share-based Payment Arrangement [Text Block] COVID-19 Charge Type [Axis] COVID-19 Charge Type [Axis] COVID-19 Charge Type Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Accounting Policies [Abstract] Payment of deferred offering costs Payments of Stock Issuance Costs Share issuance (in shares) Stock Issued During Period, Shares, New Issues Accounting and consulting Accrued Professional Fees, Current Construction liabilities Construction Payable, Current Total present value of lease liabilities Operating Lease, Liability Common stock; $0.01 par value; 300,000,000 shares authorized; 45,013,784 shares issued and outstanding Common Stock, Value, Issued Finance leases Finance Lease, Weighted Average Discount Rate, Percent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Other income, net Nonoperating Income (Expense) Weighted-average period of recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance-based option awards Performance Shares [Member] Commitments and contingencies Commitments and Contingencies Subsequent Event [Table] Subsequent Event [Table] Leases Lessee, Operating Leases [Text Block] Amortization of leased assets Finance Lease, Right-of-Use Asset, Amortization Gift card sales Contract with Customer, Liability, Gift Card Revenue, Cash Received Contract with Customer, Liability, Gift Card Revenue, Cash Received 2021 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Receivables [Abstract] Document Period End Date Document Period End Date Total operating costs and expenses Costs and Expenses Utilities Accrued Utilities, Current Class of Stock [Axis] Class of Stock [Axis] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Entity Registrant Name Entity Registrant Name Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Aggregate net proceeds from IPO Sale of Stock, Consideration Received on Transaction Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Prepaid expenses Increase (Decrease) in Prepaid Expense Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Common Stock Common Stock [Member] Variable Rate [Axis] Variable Rate [Axis] Finance leases Finance Lease, Weighted Average Remaining Lease Term Deferred franchise fee revenue - current Contract with Customer, Liability, Franchise Fee Revenue, Current Contract with Customer, Liability, Franchise Fee Revenue, Current Income (Loss) from operations Operating Income (Loss) Current portion of operating lease liabilities Operating lease liabilities - current Operating Lease, Liability, Current Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Variable Rate [Domain] Variable Rate [Domain] Additional Paid-in Capital Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Changes in contract liabilities, deferred gift card revenue Change In Contract with Customer, Liability, Gift Card Revenue [Roll Forward] Change In Contract with Customer, Liability, Gift Card Revenue Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Number of anniversaries Share Based Compensation Arrangement by Share Based Payment Award Number Of Anniversaries For Vesting Of Awards Share Based Compensation Arrangement by Share Based Payment Award Number Of Anniversaries For Vesting Of Awards Accrued liabilities Increase (Decrease) in Accrued Liabilities Estimated fair value of outstanding debt, excluding finance lease liabilities and financing obligations Long-term Debt, Fair Value Capital expenditures Payments to Acquire Property, Plant, and Equipment Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Total liabilities Liabilities Other expenses Other COVID-19 Expenses [Member] Other COVID-19 Expenses Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Award Type [Axis] Award Type [Axis] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Operating Lease Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Variable rate, floor Debt Instrument, Interest Rate, Variable Rate, Floor Debt Instrument, Interest Rate, Variable Rate, Floor Total equity Beginning Balance Ending Balance Stockholders' Equity Attributable to Parent Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Second Amendment Delayed Draw Second Amendment Delayed Draw [Member] Second Amendment Delayed Draw Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt New Facilities New Facilities [Member] New Facilities Equity: Stockholders' Equity Attributable to Parent [Abstract] Operating lease liabilities Operating lease liabilities - non-current Operating Lease, Liability, Noncurrent Total future minimum lease payments Finance Lease, Liability, Payment, Due Legal services and contingencies Accrued Professional Fees And Contingencies, Current Accrued Professional Fees And Contingencies, Current Interest expense Interest Expense 2022 Finance Lease, Liability, to be Paid, Year One Accrued compensation and deferred payroll taxes, current and long-term Increase (Decrease) in Employee Related Liabilities Interest rate Debt Instrument, Interest Rate, Effective Percentage Initial Term Loan Initial Term Loan [Member] Initial Term Loan City Area Code City Area Code Accumulated deficit Retained Earnings (Accumulated Deficit) Property tax Accrual for Taxes Other than Income Taxes, Current Unusual or Infrequent Items, or Both [Abstract] Statement of Stockholders' Equity [Abstract] Finance lease liabilities Total present value of lease liabilities Finance Lease, Liability Vesting on second anniversary of initial public offer Share-based Payment Arrangement, Tranche Two [Member] Variable rate used to determine alternate base rate Debt Instrument, Basis Spread On Variable Rate Used To Determine Alternate Base Rate Debt Instrument, Basis Spread On Variable Rate Used To Determine Alternate Base Rate Total lease liabilities Lease, Liability Lease, Liability Income Statement [Abstract] Amendment Flag Amendment Flag Deferred franchise fee revenue - non-current Contract with Customer, Liability, Franchise Fee Revenue, Noncurrent Contract with Customer, Liability, Franchise Fee Revenue, Noncurrent 2024 Finance Lease, Liability, to be Paid, Year Three 2025 Finance Lease, Liability, to be Paid, Year Four Underwriting discounts and commissions Sale Of Stock, Offering Discounts And Commissions Sale Of Stock, Offering Discounts And Commissions Deferred offering costs Increase (Decrease) In Deferred Offering Costs Increase (Decrease) In Deferred Offering Costs 2023 Finance Lease, Liability, to be Paid, Year Two Income tax expense (benefit) Income Tax Expense (Benefit) Accounts receivable Total accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Equity Components [Axis] Equity Components [Axis] Total current assets Assets, Current Shares issued on conversion (in shares) Conversion of Stock, Shares Issued Total future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Third-party delivery sales Third-Party Delivery Sales [Member] Third-Party Delivery Sales Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Sale of Stock [Domain] Sale of Stock [Domain] Inventory Inventory, Net Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Entity File Number Entity File Number Statement of Financial Position [Abstract] Contingent consideration liability, noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Product and Service [Axis] Product and Service [Axis] Changes in contract liabilities, deferred franchise fee revenue Change In Contract with Customer, Liability, Franchise Fee Revenue [Roll Forward] Change In Contract with Customer, Liability, Franchise Fee Revenue Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Small Business Entity Small Business Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Equity Component [Domain] Equity Component [Domain] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Summary of the charges recorded in connection with the COVID-19 pandemic Schedule of Unusual or Infrequent Items, or Both [Table Text Block] Entity Ex Transition Period Entity Ex Transition Period Statement [Line Items] Statement [Line Items] Property, fixtures and equipment, net of accumulated depreciation of $107,994 and $86,250, respectively Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Weighted-average remaining lease term (in years) Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term Deferred revenues, current and long-term Increase (Decrease) in Contract with Customer, Liability Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Schedule of Estimated Fair Value of the Outstanding Debt, Excluding Finance Lease Liabilities and Financing Obligations Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Debt Disclosure [Abstract] Entity Address, State or Province Entity Address, State or Province Finance lease liabilities - current Finance Lease, Liability, Current Income (Loss) before income tax expense (benefit) Income (Loss) before income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Company-owned restaurants Entity Operated Units [Member] Interest on lease liabilities Finance Lease, Interest Expense Use of Estimates Use of Estimates, Policy [Policy Text Block] Computations of Basic and Diluted Net Income (Loss) per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Entity Shell Company Entity Shell Company Local Phone Number Local Phone Number Forecast Forecast [Member] Finance Leases Finance Lease, Liability, Payment, Due [Abstract] Vesting [Axis] Vesting [Axis] Total assets Assets Plan Name [Domain] Plan Name [Domain] Common stock authorized (in shares) Common Stock, Shares Authorized Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Net income (loss) Net Income (Loss) Available to Common Stockholders, Diluted Net income (loss) Net Income (Loss) Available to Common Stockholders, Basic Title of Individual [Axis] Title of Individual [Axis] Accrued Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Product and Service [Domain] Product and Service [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Interest rate Debt Instrument, Interest Rate, Stated Percentage Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Gift card breakage Contract with Customer, Liability, Gift Card Revenue, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Contract with Customer, Liability, Gift Card Revenue, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Contingent consideration liability Business Combination, Contingent Consideration, Liability Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Quarterly amortization payment percentage Debt Instrument, Interest Rate, Annual Amortization Rate, Payable, Percentage Debt Instrument, Interest Rate, Annual Amortization Rate, Payable, Percentage Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Franchisor Disclosure [Table] Schedule of Franchisor Disclosure [Table] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Short-term debt Short-term Debt Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Supplemental Cash Flow Information Lease, Cost [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity Tax Identification Number Entity Tax Identification Number Deferred Offering Costs Deferred Charges, Policy [Policy Text Block] Subsequent Event [Line Items] Subsequent Event [Line Items] 2021 Equity Incentive Plan First Watch Restaurant Group, Inc. 2021 Equity Incentive Plan [Member] First Watch Restaurant Group, Inc. 2021 Equity Incentive Plan Franchise revenues recognized Contract with Customer, Liability, Franchise Fee Revenue, Revenue Recognized Contract with Customer, Liability, Franchise Revenue Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net income (loss) per common share - diluted (in dollars per share) Earnings Per Share, Diluted Repayments of borrowings on revolving credit facility Repayments of Long-term Lines of Credit Amortization of debt discount and deferred issuance costs Amortization of Debt Issuance Costs and Discounts Initial public offering price (in dollars per share) Sale of Stock, Price Per Share Non-cash operating lease costs Operating Lease, Right-of-Use Asset, Amortization Expense Vesting [Domain] Vesting [Domain] Annual increase to number of shares that may be issued, percentage of total number of shares of common stock actually issued and outstanding on last day of preceding fiscal year Share-Based Compensation Arrangement by Share-Based Payment Award, Increase To Number Of Shares That Can Be Issued Each Fiscal Year, Percentage Of Issued And Outstanding Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Increase To Number Of Shares That Can Be Issued Each Fiscal Year, Percentage Of Issued And Outstanding Shares Cash paid for income taxes, net of refunds Income Taxes Paid, Net Rebate receivables Accounts Receivable, after Allowance for Credit Loss, Rebates, Current Accounts Receivable, after Allowance for Credit Loss, Rebates, Current Subsequent Events Subsequent Events [Text Block] Restaurant sales Franchisor Owned Outlet [Member] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Deferred income taxes Deferred Income Tax Liabilities, Net Loans Payable Loans Payable [Member] Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Transaction expenses (income), net Other Cost and Expense, Operating Schedule of Components of Income Tax Expense (Benefit) and Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Finance Lease Maturity Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Accounts payable Accounts Payable, Current Increase in fair value of awards Share-based Payment Arrangement, Plan Modification, Increase In Fair Value Share-based Payment Arrangement, Plan Modification, Increase In Fair Value Health insurance premiums paid for furloughed employees, net of employee retention credits Health Insurance Premiums Paid For Furloughed Employees [Member] Health Insurance Premiums Paid For Furloughed Employees Proceeds from borrowings on revolving credit facility Proceeds from Long-term Lines of Credit Inventory Increase (Decrease) in Inventories Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Impairments and loss on disposal of assets Gain (Loss) on Sale of Assets and Asset Impairment Charges Revenues: Revenues [Abstract] Other restaurant operating expenses Other Cost of Operating Revenue Purchase of intangible assets Payments to Acquire Intangible Assets Total lease expense Lease, Cost Income Statement Location [Domain] Income Statement Location [Domain] Supplemental disclosures of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Interest converted to long-term debt Interest Converted To Long-Term Debt Interest Converted To Long-Term Debt Other long-term liabilities Other Liabilities, Noncurrent Long-Term Debt, Net Schedule of Long-term Debt Instruments [Table Text Block] Fiscal Period, Policy Fiscal Period, Policy [Policy Text Block] Food and beverage costs Cost, Direct Material Debt Instrument [Line Items] Debt Instrument [Line Items] Repayments of long-term debt Repayments of Long-term Debt Earnings Per Share, Basic [Abstract] Earnings Per Share [Abstract] Repayments of long-term debt Repayments of Other Long-term Debt Balance, beginning of period Balance, end of period Contract with Customer, Liability, Franchise Fee Revenue Contract with Customer, Liability, Franchise Fee Revenue Document Quarterly Report Document Quarterly Report Other assets, current and long-term Increase (Decrease) in Other Operating Assets Proceeds from preferred stock issuance Proceeds from Issuance of Preferred Stock and Preference Stock Vesting on 273rd day following the second anniversary of initial public offering Share-based Payment Arrangement, Tranche Three [Member] Terminations of operating lease liabilities Terminations Of Operating Lease Liabilities Terminations Of Operating Lease Liabilities Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Operating costs and expenses: Costs and Expenses [Abstract] Total debt, net Debt and Lease Obligation Weighted-average discount rate Leases, Weighted Average Discount Rate [Abstract] Leases, Weighted Average Discount Rate Stock-based compensation expense Share-based Payment Arrangement, Expense Total COVID-19 charges COVID-19 Chrages COVID-19 Chrages Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Table] Document Fiscal Period Focus Document Fiscal Period Focus Effective tax rate Effective Income Tax Rate Reconciliation, Percent Restricted cash Restricted Cash, Current Franchise-owned restaurants Franchised Units [Member] Payables and Accruals [Abstract] Blended federal and state statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory And State And Local Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory And State And Local Income Tax Rate, Percent Remeasurements of finance lease assets and lease liabilities Remeasurements Of Finance Lease Assets And Lease Liabilities Remeasurements Of Finance Lease Assets And Lease Liabilities Cash and cash equivalents and restricted cash, Beginning of period Cash and cash equivalents and restricted cash, End of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Shares of common stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Labor and other related expenses Cost, Direct Labor Restaurant operating expenses (exclusive of depreciation and amortization shown below): Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization [Abstract] Cash received Contract with Customer, Liability, Franchise Fee Revenue, Cash Received Contract with Customer, Liability, Cash Received Balance, beginning of period Balance, end of period Contract with Customer, Liability, Gift Card Revenue Contract with Customer, Liability, Gift Card Revenue Current assets: Assets, Current [Abstract] Shares reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Leases [Abstract] Entity Central Index Key Entity Central Index Key London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Security Exchange Name Security Exchange Name Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Compensation for employees upon furlough and return from furlough Compensation For Furloughed Employees [Member] Compensation For Furloughed Employees Alternate base rate, floor Debt Instrument, Interest Rate, Alternate Base Rate, Floor Debt Instrument, Interest Rate, Alternate Base Rate, Floor Income Taxes Income Tax Disclosure [Text Block] Requisite service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Over-Allotment Option Over-Allotment Option [Member] Denominator Weighted Average Number of Shares Outstanding, Basic [Abstract] In-restaurant dining sales In-Restaurant Dining Sales [Member] In-Restaurant Dining Sales Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Unusual or Infrequent Item, or Both [Line Items] Unusual or Infrequent Item, or Both [Line Items] Common area maintenance Accrued Common Area Maintenance, Current Accrued Common Area Maintenance, Current Statement of Cash Flows [Abstract] Class of Stock [Line Items] Class of Stock [Line Items] Credit Facility [Axis] Credit Facility [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Total lease assets Lease, Right-of-Use Asset Lease, Right-of-Use Asset Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] General and administrative expenses General and Administrative Expense [Member] Consolidation, Policy Consolidation, Policy [Policy Text Block] Remeasurements of operating lease assets and lease liabilities Remeasurements Of Operating Lease Assets And Lease Liabilities Remeasurements Of Operating Lease Assets And Lease Liabilities Total current liabilities Liabilities, Current Class of Stock [Domain] Class of Stock [Domain] Deferred gift card revenue Contract with Customer, Liability, Gift Card Revenue, Current Contract with Customer, Liability, Gift Card Revenue, Current Operating cash flows - finance leases Finance Lease, Interest Payment on Liability Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Entity Address, Postal Zip Code Entity Address, Postal Zip Code Less: Unamortized debt discount and deferred issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 2021 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Newly Issued Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Royalty and system fund contributions Royalty And System Fund Contributions [Member] Royalty And System Fund Contributions Stock-based compensation expense not yet recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Franchise revenues Franchise [Member] Subsequent Event Subsequent Event [Member] Cover [Abstract] Finance lease liabilities - non-current Finance Lease, Liability, Noncurrent Preferred Stock Preferred Stock [Member] Goodwill Goodwill Cost of sales Cost of Sales [Member] Contingent rent Accrued Liabilities, Operating Leases, Contingent Rentals, Current Accrued Liabilities, Operating Leases, Contingent Rentals, Current Scenario [Domain] Scenario [Domain] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Operating lease expense Operating Lease, Cost Chairman Emeritus Executive Officer [Member] Deferred income taxes Deferred Income Tax Expense (Benefit) Amount of monthly installment Debt Instrument, Periodic Payment