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Revenue - Schedule of Revenues Disaggregated by Revenue Source and Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 331,796	$ 400,361
North America
Disaggregation Of Revenue [Line Items]
Revenues, net	221,315	283,706
Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	81,896	79,990
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	19,067	25,028
Other
Disaggregation Of Revenue [Line Items]
Revenues, net	9,518	11,637
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	206,062	174,545
Digital Subscription Revenues | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	132,090	116,349
Digital Subscription Revenues | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	58,915	46,638
Digital Subscription Revenues | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	9,809	7,576
Digital Subscription Revenues | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	5,248	3,982
Workshops + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net	73,758	150,112
Workshops + Digital Fees | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	54,904	112,843
Workshops + Digital Fees | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	10,940	21,519
Workshops + Digital Fees | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	5,169	11,129
Workshops + Digital Fees | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	2,745	4,621
Subscription
Disaggregation Of Revenue [Line Items]
Revenues, net	279,820	324,657
Subscription | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	186,994	229,192
Subscription | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	69,855	68,157
Subscription | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	14,978	18,705
Subscription | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	7,993	8,603
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net	51,976	75,704
Product sales and other, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	34,321	54,514
Product sales and other, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	12,041	11,833
Product sales and other, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	4,089	6,323
Product sales and other, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 1,525	$ 3,034

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