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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details)
$ in Thousands
6 Months Ended
Jun. 28, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 219,908
Payments (140,718)
Revaluations (29,951)
Translation adjustment 40
Ending balance 49,279
NeoTract, Inc. [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Payments to acquire businesses, gross $ 140,600