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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 30, 2016
Sep. 30, 2016
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Fair Value $ 60.0 $ 95.3
Fair Value, Measurements, Recurring    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Other assets 1.8  
Total assets measured at fair value 61.8 95.3
Contingent consideration (1.1) (1.3)
Total liabilities measured at fair value (1.1) (1.3)
Fair Value, Measurements, Recurring | Corporate debt securities    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Fair Value 60.0 95.3
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Other assets 1.8  
Total assets measured at fair value 1.8 0.0
Contingent consideration 0.0 0.0
Total liabilities measured at fair value 0.0 0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments | Corporate debt securities    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Fair Value 0.0 0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Other assets 0.0  
Total assets measured at fair value 0.0 0.0
Contingent consideration 0.0 0.0
Total liabilities measured at fair value 0.0 0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs | Corporate debt securities    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Fair Value 0.0 0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Other assets 0.0  
Total assets measured at fair value 60.0 95.3
Contingent consideration (1.1) (1.3)
Total liabilities measured at fair value (1.1) (1.3)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs | Corporate debt securities    
Assets/Liabilities Measured at Fair Value on a Recurring Basis    
Fair Value $ 60.0 $ 95.3