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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Cost $ 1,387.5 $ 1,389.2
Accumulated Amortization (442.8) (399.2)
Net 944.7 990.0
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 987.8 985.2
Accumulated Amortization (276.0) (247.4)
Net $ 711.8 737.8
Customer Relationships [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 18 years 6 months  
Customer Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 2 years  
Customer Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Technology Assets [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 11 years 1 month 6 days  
Technology Assets [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 4 years  
Technology Assets [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 18 years  
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 165.4 165.4
Accumulated Amortization (81.4) (73.7)
Net $ 84.0 91.7
Trade Names [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 16 years 2 months 12 days  
Trade Names [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 8 years  
Trade Names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 17 years  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 234.3 238.6
Accumulated Amortization (85.4) (78.1)
Net $ 148.9 $ 160.5