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Contingencies and Commitments - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]      
Committed future sublease income, 2016 $ 1,067    
Committed future sublease income, 2017 306    
Committed future sublease income, 2018 317    
Committed future sublease income, 2019 219    
Rent expense, net of sublease income $ 47,032 $ 45,032 $ 45,610
Product warranty, limited warranty period offered 90 days