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Retirement plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Apr. 03, 2021
Mar. 28, 2020
Retirement Benefits [Abstract]        
Employer contribution $ 1.8 $ 1.5 $ 3.5 $ 3.1