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Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 205,955	$ 214,871	$ 226,830	$ 241,895	$ 222,902	$ 249,718	$ 269,454	$ 297,761	$ 889,551	$ 1,039,835	$ 1,211,165
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net									571,074	662,668	786,563
Workshops + Digital Fees
Disaggregation Of Revenue [Line Items]
Revenues, net									221,139	256,387	274,866
Clinical Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net									30,542
Subscription Revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net									822,755	919,055	1,061,429
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net									$ 66,796	$ 120,780	$ 149,736

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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