Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Goodwill	$ 2,806,000		$ 2,806,000		$ 2,873,000
Amortization of intangible assets	$ 100,000	$ 0	$ 298,000	$ 0
Minimum [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets			5 years
Maximum [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets			6 years