Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets
NOL carryforwards and tax credit carryforwards	$ 34,305	$ 60,081
Stock-based compensation	14,879	10,568
Nondeductible reserves and accruals	8,550	7,573
Amortizable intangibles other than goodwill	2,420	2,993
Capitalized research and development	442	1,597
Foreign NOL carryforwards	17,635	19,617
Deferred revenue	3,351	2,669
Depreciation	353	276
Other, net	1,802	1,298
Deferred Tax Assets, Gross, Total	83,737	106,672
Deferred tax liabilities
Indefinite lived intangibles	(8,480)	(7,530)
In-process research and development	(4,649)	(4,443)
Domestic deferred tax liability on foreign NOL carryforwards	(10,488)	(12,276)
Deferred Tax Liabilities, Net	(23,617)	(24,249)
Net deferred tax assets	60,120	82,423
Valuation allowance	(2,418)	(2,912)
Net deferred tax assets	57,702	79,511
Long-term deferred tax assets, net	58,534	80,306
Long-term deferred tax liabilities	(832)	(795)
Net deferred tax assets	$ 57,702	$ 79,511