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Pension and Other Employee Benefits - Schedule of Expected Pension Benefit (Detail)
$ in Millions
Sep. 26, 2015
USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2016 $ 0.3
2017 0.3
2018 0.4
2019 0.4
2020 0.4
2021 to 2025 $ 2.0