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Revenue - Schedule of Revenues Disaggregated by Revenue Source (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Disaggregation Of Revenue [Line Items]      
Revenues, net $ 785,921 $ 889,551 $ 1,039,835
Digital Subscription Revenues      
Disaggregation Of Revenue [Line Items]      
Revenues, net 512,853 571,074 662,668
Workshops + Digital Subscription Revenues      
Disaggregation Of Revenue [Line Items]      
Revenues, net 186,139 221,139 256,387
Clinical Subscription Revenues      
Disaggregation Of Revenue [Line Items]      
Revenues, net 78,001 30,542  
Subscription Revenues, net      
Disaggregation Of Revenue [Line Items]      
Revenues, net 776,993 822,755 919,055
Other Revenues, net      
Disaggregation Of Revenue [Line Items]      
Revenues, net $ 8,928 $ 66,796 $ 120,780