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Revenue - Schedule of Revenues Disaggregated by Revenue Source and Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 311,379 $ 333,637 $ 643,175 $ 733,998
North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 207,629 227,525 428,945 511,232
Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 77,936 77,819 159,831 157,809
United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 17,002 19,737 36,070 44,765
Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 8,812 8,556 18,329 20,192
Digital Subscription Revenues        
Disaggregation Of Revenue [Line Items]        
Revenues, net 205,337 177,921 411,398 352,466
Digital Subscription Revenues | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 130,255 115,922 262,345 232,272
Digital Subscription Revenues | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 60,602 50,704 119,515 97,341
Digital Subscription Revenues | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 9,594 7,571 19,404 15,147
Digital Subscription Revenues | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 4,886 3,724 10,134 7,706
Workshops + Digital Fees        
Disaggregation Of Revenue [Line Items]        
Revenues, net 67,534 115,076 141,293 265,188
Workshops + Digital Fees | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 51,699 86,131 106,604 198,974
Workshops + Digital Fees | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 8,732 17,858 19,671 39,377
Workshops + Digital Fees | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 4,606 8,001 9,776 19,130
Workshops + Digital Fees | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 2,497 3,086 5,242 7,707
Subscription        
Disaggregation Of Revenue [Line Items]        
Revenues, net 272,871 292,997 552,691 617,654
Subscription | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 181,954 202,053 368,949 431,246
Subscription | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 69,334 68,562 139,186 136,718
Subscription | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 14,200 15,572 29,180 34,277
Subscription | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 7,383 6,810 15,376 15,413
Product sales and other, net        
Disaggregation Of Revenue [Line Items]        
Revenues, net 38,508 40,640 90,484 116,344
Product sales and other, net | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 25,675 25,472 59,996 79,986
Product sales and other, net | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 8,602 9,257 20,645 21,091
Product sales and other, net | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 2,802 4,165 6,890 10,488
Product sales and other, net | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 1,429 $ 1,746 $ 2,953 $ 4,779