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Pension and Other Employee Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 27, 2014
Sep. 28, 2013
Other Liabilities Disclosure [Abstract]    
Defined Benefit Pension Plan, Liabilities $ (10.3) $ (10.1)
Projected benefit obligations in excess of plan assets (10.3) (10.1)
Accumulated benefit obligation (10.3) (10.1)
Projected benefit obligation for long-term service awards $ 0.2 $ 0.6