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Business combinations and investments - Pro forma results (Details) - Bioness, Inc - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Business Acquisition [Line Items]        
Net sales $ 109,816 $ 65,955 $ 200,541 $ 157,570
Net (loss) income $ (6,841) $ (12,962) $ 16,333 $ (11,376)
Earnings per share of Class A common stock(1):        
Basic (in dollars per share) $ (0.03)   $ (0.08)  
Diluted (in dollars per share) $ (0.03)   $ (0.08)