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Revenues - Change in Contract Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 29, 2026 | Mar. 30, 2025
Changes in contract liabilities, deferred gift card revenue |  |
Balance, beginning of period | $ 6,548 | $ 5,385
Gift card sales | 1,846 | 1,548
Gift card redemptions | (3,837) | (3,374)
Gift card breakage | (465) | (405)
Balance, end of period | 4,092 | 3,154
Changes in contract liabilities, deferred franchise fee revenue |  |
Balance, beginning of period | 1,456 | 1,929
Cash received | 72 | 35
Franchise revenues recognized | (56) | (62)
Balance, end of period | $ 1,472 | $ 1,902

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- Definition Change In Contract with Customer, Liability, Franchise Fee Revenue + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Change In Contract with Customer, Liability, Gift Card Revenue + References No definition available. + Details
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Namespace Prefix: | fwrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Contract with Customer, Liability, Franchise Fee Revenue + References No definition available. + Details
Name: | fwrg_ContractWithCustomerLiabilityFranchiseFeeRevenue
Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability, Cash Received + References No definition available. + Details
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Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability, Franchise Revenue + References No definition available. + Details
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Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contract with Customer, Liability, Gift Card Revenue + References No definition available. + Details
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Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability, Gift Card Revenue, Cash Received + References No definition available. + Details
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Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability, Gift Card Revenue, Cumulative Catch-up Adjustment to Revenue, Modification of Contract + References No definition available. + Details
Name: | fwrg_ContractWithCustomerLiabilityGiftCardRevenueCumulativeCatchUpAdjustmentToRevenueModificationOfContract
Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability, Gift Card Revenue, Revenue Recognized + References No definition available. + Details
Name: | fwrg_ContractWithCustomerLiabilityGiftCardRevenueRevenueRecognized
Namespace Prefix: | fwrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration