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Retirement Plans - Schedule of Estimated Future Benefit Payments (Detail) - Defined Benefit Plans
$ in Millions
Sep. 28, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 7.9
2020 6.7
2021 8.7
2022 9.0
2023 7.1
Thereafter 44.7
Total $ 84.1