Changes in Valuation Allowance for Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Valuation Allowance [Line Items]
Balance at Beginning of Period	$ 2,418	$ 2,912	$ 102,093
Decreases recorded as benefit to income tax provision		(1,171)	(101,468)
Increases due to foreign net operating loss in certain foreign jurisdictions	50	677	2,287
Balance at End of Period	$ 2,468	$ 2,418	$ 2,912