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Pension and Other Employee Benefits - Schedule of Expected Pension Benefit (Detail)
$ in Millions
Sep. 24, 2016
USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2017 $ 0.3
2018 0.3
2019 0.4
2020 0.4
2021 0.4
2022 to 2026 $ 2.0