Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 311,379	$ 333,637	$ 643,175	$ 733,998
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	205,337	177,921	411,398	352,466
Workshops + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net	67,534	115,076	141,293	265,188
Subscription
Disaggregation Of Revenue [Line Items]
Revenues, net	272,871	292,997	552,691	617,654
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 38,508	$ 40,640	$ 90,484	$ 116,344