Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		48 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2013
Schedule Of Income Taxes [Line Items]
Possible additional federal and state income taxes estimated from the income tax assessment									$ 3,000
Provision for income tax expense (benefit)	$ (102)	$ 1,600		$ 27	$ 500	$ 900	$ (71)	$ 232
Tax net operating loss can be carried forward							20 years
Maximum
Schedule Of Income Taxes [Line Items]
Estimated income taxes liability, penalties and interest accrued	600						$ 600
Estimated income taxes liability, penalties and interest recorded as income tax expense		$ 100	$ 400				100
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	1,800						1,800
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 300						$ 300