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Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 120 $ 120 $ 129