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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 15, 2015
Sep. 19, 2013
Nov. 09, 2009
Sep. 30, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Loss Contingencies [Line Items]              
Rental expense for operating leases         $ 112.0 $ 89.0 $ 71.0
Future minimum rental commitments on noncancelable leases due in 2017         74.0    
Future minimum rental commitments on noncancelable leases due in 2018         55.0    
Future minimum rental commitments on noncancelable leases due in 2019         48.0    
Future minimum rental commitments on noncancelable leases due in 2020         38.0    
Future minimum rental commitments on noncancelable leases due in 2021         30.0    
Future minimum rental commitments on noncancelable leases thereafter         33.0    
Aggregate future purchase commitments         $ 1,413.0    
RTI Technologies              
Loss Contingencies [Line Items]              
Damages awarded $ 341.0 $ 113.5 $ 5.0        
Pre-tax charge relating to an unfavorable litigation verdict       $ 341.0      
Professional Fees $ 12.0