Revenue - Schedule of Revenues Disaggregated by Revenue Source and Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 323,427	$ 320,699	$ 333,637	$ 400,361	$ 332,583	$ 348,567	$ 369,023	$ 363,164	$ 1,378,124	$ 1,413,337	$ 1,514,121
North America
Disaggregation Of Revenue [Line Items]
Revenues, net									942,100	979,302	1,047,251
Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net									313,380	293,233	304,325
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net									84,387	94,557	107,072
Other
Disaggregation Of Revenue [Line Items]
Revenues, net									38,257	46,245	55,473
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net									743,060	609,996	567,767
Digital Subscription Revenues | North America
Disaggregation Of Revenue [Line Items]
Revenues, net									484,471	401,890	378,678
Digital Subscription Revenues | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net									207,978	167,008	149,571
Digital Subscription Revenues | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net									33,919	26,898	25,557
Digital Subscription Revenues | Other
Disaggregation Of Revenue [Line Items]
Revenues, net									16,692	14,200	13,961
Workshop + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net									443,429	597,270	705,429
Workshop + Digital Fees | North America
Disaggregation Of Revenue [Line Items]
Revenues, net									329,885	446,576	522,372
Workshop + Digital Fees | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net									67,201	87,962	107,528
Workshop + Digital Fees | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net									33,283	44,145	52,676
Workshop + Digital Fees | Other
Disaggregation Of Revenue [Line Items]
Revenues, net									13,060	18,587	22,853
Subscription
Disaggregation Of Revenue [Line Items]
Revenues, net									1,186,489	1,207,266	1,273,196
Subscription | North America
Disaggregation Of Revenue [Line Items]
Revenues, net									814,356	848,466	901,050
Subscription | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net									275,179	254,970	257,099
Subscription | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net									67,202	71,043	78,233
Subscription | Other
Disaggregation Of Revenue [Line Items]
Revenues, net									29,752	32,787	36,814
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net									191,635	206,071	240,925
Product sales and other, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net									127,744	130,836	146,201
Product sales and other, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net									38,201	38,263	47,226
Product sales and other, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net									17,185	23,514	28,839
Product sales and other, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net									$ 8,505	$ 13,458	$ 18,659