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Revenues - Detail of Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 28, 2025	Dec. 29, 2024
Revenue from Contract with Customer [Abstract]
Deferred gift card revenue	$ 2,423	$ 5,385
Deferred franchise fee revenue - current	214	238
Total current deferred revenues	2,637	5,623
Deferred franchise fee revenue - non-current	$ 1,242	$ 1,691

X

- Definition

Contract with Customer, Liability, Franchise Fee Revenue, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	fwrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract with Customer, Liability, Franchise Fee Revenue, Noncurrent

+ References

No definition available.

+ Details

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Namespace Prefix:	fwrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract with Customer, Liability, Gift Card Revenue, Current

+ References

No definition available.

+ Details

Name:	fwrg_ContractWithCustomerLiabilityGiftCardRevenueCurrent
Namespace Prefix:	fwrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

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Period Type:	instant

X

- References

No definition available.

+ Details

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