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Pension and Other Employee Benefits - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 26, 2015
Sep. 27, 2014
Other Liabilities Disclosure [Abstract]    
Defined Benefit Pension Plan, Liabilities $ (10.0) $ (10.3)
Projected benefit obligations in excess of plan assets (10.0) (10.3)
Accumulated benefit obligation (10.0) (10.3)
Projected benefit obligation for long-term service awards $ 0.1 $ 0.2