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Goodwill and Intangibles, net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule Of Other Intangible Assets [Line Items]    
Amortization expense for intangible assets $ 6.7us-gaap_AmortizationOfIntangibleAssets $ 5.0us-gaap_AmortizationOfIntangibleAssets