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Pension and Other Employee Benefits - Schedule of Reconciliation of Benefit Obligations, Plan Assets Funded Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Other Liabilities Disclosure [Abstract]      
Benefit obligation at beginning of year $ (10.3) $ (10.1) $ (9.7)
Service cost 0.0 0.0 0.0
Interest cost (0.3) (0.3) (0.4)
Plan participants' contributions 0.0 0.0 0.0
Actuarial (loss) gain (0.9) (0.8) 0.2
Foreign exchange gain (loss) 1.2 0.6 (0.5)
Benefits paid 0.3 0.3 0.3
Benefit obligation at end of year (10.0) (10.3) (10.1)
Plan assets 0.0 0.0 0.0
Funded status $ (10.0) $ (10.3) $ (10.1)