Revenue - Schedule of Revenues Disaggregated by Revenue Source (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
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net									743,060	609,996	567,767
Workshop + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net									443,429	597,270	705,429
Subscription
Disaggregation Of Revenue [Line Items]
Revenues, net									1,186,489	1,207,266	1,273,196
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net									$ 191,635	$ 206,071	$ 240,925