Changes in Valuation Allowance for Deferred Tax Assets (Detail) (Valuation Allowance of Deferred Tax Assets, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Valuation Allowance of Deferred Tax Assets
Valuation Allowance [Line Items]
Balance at Beginning of Period	$ 102,093	$ 106,670
Decreases recorded as benefit to income tax provision	(101,468)	(4,577)
Increases due to foreign net operating loss in certain foreign jurisdictions	2,287
Balance at End of Period	$ 2,912	$ 102,093