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Shareholders' equity - Reconciliation of basic to diluted weighted average common shares outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Equity [Abstract]    
Basic (in shares) 46,698 46,382
Dilutive effect of share-based awards (in shares) 709 849
Diluted (in shares) 47,407 47,231