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Pension and Other Employee Benefits - Schedule of Expected Pension Benefit (Detail)
$ in Millions
Sep. 29, 2018
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2017 $ 0.4
2018 0.4
2019 0.4
2020 0.4
2021 0.4
2023 to 2027 $ 2.1