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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 27, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   $ 36,633
Payments   (30,489)
Revaluations   7,848
Translation adjustments   (18)
Ending balance $ 13,974 13,974
Essential Medical, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Settlement payment $ 17,400 $ 17,400