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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 26, 2016
Sep. 26, 2015
Assets:    
Assets measured at fair value on a recurring basis $ 5.7  
Interest Rate Cash Flow Hedge Asset at Fair Value   $ 6.9
Liabilities:    
Liabilities measured at fair value on a recurring basis 38.5  
Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.8  
Interest rate cap - derivative    
Assets:    
Interest Rate Cash Flow Hedge Asset at Fair Value 3.7  
Foreign Exchange Contract [Member]    
Assets:    
Foreign Currency Contract, Asset, Fair Value Disclosure 1.2  
Liabilities:    
Foreign Currency Contracts, Liability, Fair Value Disclosure 0.9  
Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis 37.6  
Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Assets measured at fair value on a recurring basis 0.8  
Liabilities:    
Liabilities measured at fair value on a recurring basis 37.6  
Quoted Prices in Active Market for Identical Assets (Level 1) | Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.8  
Quoted Prices in Active Market for Identical Assets (Level 1) | Interest rate cap - derivative    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Quoted Prices in Active Market for Identical Assets (Level 1) | Foreign Exchange Contract [Member]    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.0  
Quoted Prices in Active Market for Identical Assets (Level 1) | Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis 37.6  
Significant Other Observable Inputs (Level 2)    
Assets:    
Assets measured at fair value on a recurring basis 4.9  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.9  
Significant Other Observable Inputs (Level 2) | Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Significant Other Observable Inputs (Level 2) | Interest rate cap - derivative    
Assets:    
Assets measured at fair value on a recurring basis 3.7  
Significant Other Observable Inputs (Level 2) | Foreign Exchange Contract [Member]    
Assets:    
Assets measured at fair value on a recurring basis 1.2  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.9  
Significant Other Observable Inputs (Level 2) | Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.0  
Significant Unobservable Inputs (Level 3)    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.0  
Significant Unobservable Inputs (Level 3) | Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Significant Unobservable Inputs (Level 3) | Interest rate cap - derivative    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Significant Unobservable Inputs (Level 3) | Foreign Exchange Contract [Member]    
Assets:    
Assets measured at fair value on a recurring basis 0.0  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.0  
Significant Unobservable Inputs (Level 3) | Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis $ 0.0