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Retirement Plans - Schedule of Estimated Future Benefit Payments (Detail) - Defined Benefit Plans
$ in Millions
Sep. 29, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 6.6
2019 6.9
2020 6.2
2021 7.6
2022 7.9
Thereafter 41.4
Total $ 76.6