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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Millions
Apr. 01, 2017
Sep. 24, 2016
Assets:    
Assets measured at fair value on a recurring basis $ 12.2  
Municipal Investment Agreements 5.2  
Interest Rate Cash Flow Hedge Asset at Fair Value 3.2 $ 1.4
Liabilities:    
Liabilities measured at fair value on a recurring basis 42.8  
Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.3  
Foreign Exchange Contract [Member]    
Assets:    
Foreign Currency Contract, Asset, Fair Value Disclosure 3.5  
Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis 42.8  
Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Assets measured at fair value on a recurring basis 0.3  
Liabilities:    
Liabilities measured at fair value on a recurring basis 42.8  
Quoted Prices in Active Market for Identical Assets (Level 1) | Equity securities    
Assets:    
Assets measured at fair value on a recurring basis 0.3  
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  
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) | Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis 42.8  
Significant Other Observable Inputs (Level 2)    
Assets:    
Assets measured at fair value on a recurring basis 11.9  
Liabilities:    
Liabilities measured at fair value on a recurring basis 0.0  
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) | Municipal Bonds [Member]    
Assets:    
Municipal Investment Agreements 5.2  
Significant Other Observable Inputs (Level 2) | Foreign Exchange Contract [Member]    
Assets:    
Assets measured at fair value on a recurring basis 3.5  
Significant Other Observable Inputs (Level 2) | Interest rate cap - derivative    
Assets:    
Assets measured at fair value on a recurring basis 3.2  
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) | Foreign Exchange Contract [Member]    
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) | Deferred compensation liabilities    
Liabilities:    
Liabilities measured at fair value on a recurring basis $ 0.0