Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended				12 Months Ended
	May 07, 2023	May 08, 2022	Aug. 10, 2018	Dec. 30, 2023	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Goodwill And Intangible Assets Disclosure [Line Items]
Net book value of franchise rights acquired				$ 383,811	$ 383,683			$ 383,811	$ 383,683
Net book value of goodwill				243,441	155,998			243,441	155,998	$ 157,374
Goodwill impairment	$ 0	$ 0						3,586	3,124
Finite-lived intangible assets, aggregate amortization expense								42,449	33,676	32,220
Kurbo, Inc
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment							$ 1,101
Kurbo Health, Inc
Goodwill And Intangible Assets Disclosure [Line Items]
Net purchase price			$ 3,063
Net book value of goodwill			$ 1,101
North America
Goodwill And Intangible Assets Disclosure [Line Items]
Accumulated goodwill impairment loss				1,101	1,101			1,101	1,101
Net book value of goodwill				234,225	143,567			234,225	143,567	147,530
Goodwill impairment									1,101
International
Goodwill And Intangible Assets Disclosure [Line Items]
Accumulated goodwill impairment loss				24,010	20,424			24,010	20,424
Net book value of goodwill				$ 9,216	12,431			9,216	12,431	$ 9,844
Goodwill impairment								$ 3,586	2,023
All Reporting Units Except for Republic of Ireland
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of goodwill held				100.00%				100.00%
All Reporting Units Except for Republic of Ireland | Goodwill | Minimum
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of estimated fair value in excess of carrying amount	120.00%
Republic of Ireland
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment				$ 2,383	2,023
Northern Ireland
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment				1,203
United States
Goodwill And Intangible Assets Disclosure [Line Items]
Net book value of goodwill				104,019	104,019			$ 104,019	104,019
Canada
Goodwill And Intangible Assets Disclosure [Line Items]
Net book value of goodwill				40,463	39,547			$ 40,463	$ 39,547
Franchise Rights Acquired | Northern Ireland
Goodwill And Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, impairment charges				$ 47
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]				Asset Impairment Charges
Franchise Rights Acquired | New Zealand
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					0
Franchise Rights Acquired
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges	$ 0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]	Asset Impairment Charges
Assumed cumulative annual revenue growth rate	2.80%
Franchise Rights Acquired | Minimum
Goodwill And Intangible Assets Disclosure [Line Items]
Assumed Workshops + Digital revenue growth rate	(37.10%)
Assumed operating income margin rates	(6.40%)
Assumed Digital revenue growth rate	(14.80%)
Franchise Rights Acquired | Maximum
Goodwill And Intangible Assets Disclosure [Line Items]
Assumed Workshops + Digital revenue growth rate	(18.40%)
Assumed operating income margin rates	12.70%
Assumed Digital revenue growth rate	7.50%
Franchise Rights Acquired | Other Units of Account
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges		$ 0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]		Asset Impairment Charges
Franchise Rights Acquired | Australia
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					$ 1,872
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset Impairment Charges
Percentage of franchise rights acquired				1.10%	1.10%			1.10%	1.10%
Net book value of franchise rights acquired				$ 4,232	$ 4,232			$ 4,232	$ 4,232
Franchise Rights Acquired | United States
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					$ 25,739	$ 298,291
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset Impairment Charges	Asset Impairment Charges
Percentage of franchise rights acquired				97.60%	97.60%			97.60%	97.60%
Net book value of franchise rights acquired				$ 374,353	$ 374,353			$ 374,353	$ 374,353
Franchise Rights Acquired | United Kingdom
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					$ 8,275
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset Impairment Charges
Percentage of franchise rights acquired				0.70%	0.70%			0.70%	0.70%
Net book value of franchise rights acquired				$ 2,806	$ 2,666			$ 2,806	$ 2,666
Franchise Rights Acquired | Canada
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					$ 19,657	$ 13,312	$ 24,485
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset Impairment Charges	Asset Impairment Charges	Asset Impairment Charges
Franchise Rights Acquired | New Zealand
Goodwill And Intangible Assets Disclosure [Line Items]
Indefinite-lived intangible assets, impairment charges					$ 0	$ 1,138	$ 834
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]					Asset Impairment Charges	Asset Impairment Charges	Asset Impairment Charges
Percentage of estimated fair value in excess of carrying amount	20.00%
Percentage of franchise rights acquired				0.60%	0.60%			0.60%	0.60%
Net book value of franchise rights acquired				$ 2,420	$ 2,432			$ 2,420	$ 2,432
Franchise Rights Acquired | All Reporting Units Except for New Zealand
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of franchise rights acquired				99.40%				99.40%
Franchise Rights Acquired | All Reporting Units Except for New Zealand | Minimum
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of estimated fair value in excess of carrying amount	70.00%