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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. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 293,497 $ 320,699 $ 936,672 $ 1,054,697
North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 197,797 215,195 626,742 726,426
Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 71,933 76,511 231,764 234,321
United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 15,666 20,472 51,735 65,238
Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 8,101 8,521 26,431 28,712
Digital Subscription Revenues        
Disaggregation Of Revenue [Line Items]        
Revenues, net 195,288 188,731 606,687 541,197
Digital Subscription Revenues | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 125,077 122,120 387,422 354,391
Digital Subscription Revenues | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 56,542 53,230 176,059 150,572
Digital Subscription Revenues | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 9,007 9,227 28,410 24,374
Digital Subscription Revenues | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 4,662 4,154 14,796 11,860
Workshops + Digital Fees        
Disaggregation Of Revenue [Line Items]        
Revenues, net 67,113 93,579 208,405 358,767
Workshops + Digital Fees | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 51,661 69,111 158,265 268,086
Workshops + Digital Fees | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 8,727 14,288 28,397 53,665
Workshops + Digital Fees | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 4,528 7,515 14,304 26,645
Workshops + Digital Fees | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 2,197 2,665 7,439 10,371
Subscription        
Disaggregation Of Revenue [Line Items]        
Revenues, net 262,401 282,310 815,092 899,964
Subscription | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 176,738 191,231 545,687 622,477
Subscription | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 65,269 67,518 204,456 204,237
Subscription | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 13,535 16,742 42,714 51,019
Subscription | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net 6,859 6,819 22,235 22,231
Product sales and other, net        
Disaggregation Of Revenue [Line Items]        
Revenues, net 31,096 38,389 121,580 154,733
Product sales and other, net | North America        
Disaggregation Of Revenue [Line Items]        
Revenues, net 21,059 23,964 81,055 103,949
Product sales and other, net | Continental Europe        
Disaggregation Of Revenue [Line Items]        
Revenues, net 6,664 8,993 27,308 30,084
Product sales and other, net | United Kingdom        
Disaggregation Of Revenue [Line Items]        
Revenues, net 2,131 3,730 9,021 14,219
Product sales and other, net | Other        
Disaggregation Of Revenue [Line Items]        
Revenues, net $ 1,242 $ 1,702 $ 4,196 $ 6,481