Segments - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	$ 243,770	$ 124,079	$ 435,778	$ 196,480
Total segment revenue	256,441	130,486	457,696	209,531
North America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	99,583	53,833	182,076	92,265
Total segment revenue	103,253	56,430	189,183	99,931
UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	72,148	37,238	137,824	51,431
Total segment revenue	74,060	38,610	141,540	52,840
Europe ROW [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	36,060	12,649	51,584	18,645
Total segment revenue	43,149	15,087	62,679	22,621
Reportable Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	207,791	103,720	371,484	162,341
Total segment revenue	220,462	110,127	393,402	175,392
All Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	35,979	20,359	64,294	34,139
Total segment revenue	35,979	20,359	64,294	34,139
Membership Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	68,665	46,873	129,960	89,347
Membership Revenue [Member] | North America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	33,766	22,344	63,058	43,602
Membership Revenue [Member] | UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	18,465	14,423	35,636	28,054
Membership Revenue [Member] | Europe ROW [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	7,419	5,062	14,393	10,147
Membership Revenue [Member] | Reportable Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	59,650	41,829	113,087	81,803
Membership Revenue [Member] | All Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	9,015	5,044	16,873	7,544
In House Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	116,357	47,251	207,370	63,992
In House Revenue [Member] | North America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	49,666	24,172	90,733	38,428
In House Revenue [Member] | UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	41,652	17,831	79,690	17,891
In House Revenue [Member] | Europe ROW [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	25,039	5,248	36,947	7,673
In House Revenue [Member] | Reportable Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	116,357	47,251	207,370	63,992
In House Revenue [Member] | All Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	0	0	0	0
Other Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	71,419	36,362	120,366	56,192
Other Revenue [Member] | North America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	19,821	9,914	35,392	17,901
Other Revenue [Member] | UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	13,943	6,356	26,214	6,895
Other Revenue [Member] | Europe ROW [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	10,691	4,777	11,339	4,801
Other Revenue [Member] | Reportable Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	44,455	21,047	72,945	29,597
Other Revenue [Member] | All Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment revenue	26,964	15,315	47,421	26,595
Elimination Of Equity Accounted Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	(12,671)	(6,407)	(21,918)	(13,051)
Elimination Of Equity Accounted Revenue [Member] | North America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	(3,670)	(2,597)	(7,107)	(7,666)
Elimination Of Equity Accounted Revenue [Member] | UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	(1,912)	(1,372)	(3,716)	(1,409)
Elimination Of Equity Accounted Revenue [Member] | Europe ROW [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	(7,089)	(2,438)	(11,095)	(3,976)
Elimination Of Equity Accounted Revenue [Member] | Reportable Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	(12,671)	(6,407)	(21,918)	(13,051)
Elimination Of Equity Accounted Revenue [Member] | All Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenue	$ 0	$ 0	$ 0	$ 0