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Revenue - Schedule of Revenues Disaggregated by Revenue Source and Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2022
Oct. 02, 2021
Oct. 01, 2022
Oct. 02, 2021
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 249,718 $ 293,497 $ 816,932 $ 936,672
North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 176,082 197,797 568,410 626,742
Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 56,496 71,933 189,140 231,764
United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 10,898 15,666 38,094 51,735
Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 6,242 8,101 21,288 26,431
Digital Subscription Revenues        
Disaggregation Of Revenue [Line Items]        
Revenues, net 155,881 195,288 521,582 606,687
Digital Subscription Revenues | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 102,735 125,077 342,489 387,422
Digital Subscription Revenues | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 43,638 56,542 145,920 176,059
Digital Subscription Revenues | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 5,693 9,007 20,106 28,410
Digital Subscription Revenues | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 3,815 4,662 13,067 14,796
Workshops + Digital Fees        
Disaggregation Of Revenue [Line Items]        
Revenues, net 64,865 67,113 196,540 208,405
Workshops + Digital Fees | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 52,113 51,661 155,558 158,265
Workshops + Digital Fees | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 7,586 8,727 23,599 28,397
Workshops + Digital Fees | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 3,764 4,528 12,482 14,304
Workshops + Digital Fees | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 1,402 2,197 4,901 7,439
Subscription Revenues, net        
Disaggregation Of Revenue [Line Items]        
Revenues, net 220,746 262,401 718,122 815,092
Subscription Revenues, net | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 154,848 176,738 498,047 545,687
Subscription Revenues, net | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 51,224 65,269 169,519 204,456
Subscription Revenues, net | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 9,457 13,535 32,588 42,714
Subscription Revenues, net | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 5,217 6,859 17,968 22,235
Product sales and other, net        
Disaggregation Of Revenue [Line Items]        
Revenues, net 28,972 31,096 98,810 121,580
Product sales and other, net | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 21,234 21,059 70,363 81,055
Product sales and other, net | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 5,272 6,664 19,621 27,308
Product sales and other, net | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 1,441 2,131 5,506 9,021
Product sales and other, net | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 1,025 $ 1,242 $ 3,320 $ 4,196