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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

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