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Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 124us-gaap_AmortizationOfIntangibleAssets $ 124us-gaap_AmortizationOfIntangibleAssets $ 82us-gaap_AmortizationOfIntangibleAssets