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Income taxes - Summary of Net Income From Continuing Operations Before Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jun. 27, 2020
Jul. 03, 2021
Jul. 03, 2021
Jun. 27, 2020
Jun. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxable subsidiaries:                    
Income from continuing operations before income taxes $ (9,066) $ (6,090) $ (6,090) $ 15,389 $ 15,389 $ 4,435 $ 4,435      
Bio Ventus LLC [Member]                    
Taxable subsidiaries:                    
Domestic               $ 306 $ 2,679 $ 2,925
Foreign               387 2,967 (1,393)
Income From Continuing Operations Before Income Taxes Domestic And Foreign               693 5,646 1,532
Other domestic subsidiaries               15,221 4,043 4,575
Income from continuing operations before income taxes               $ 15,914 $ 9,689 $ 6,107