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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

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