Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets
NOL carryforwards and tax credit carryforwards	$ 8,814	$ 34,305
Stock-based compensation	16,560	14,879
Nondeductible reserves and accruals	10,303	8,550
Amortizable intangibles other than goodwill	1,846	2,420
Capitalized research and development		442
Foreign NOL carryforwards	13,634	17,635
Deferred revenue	4,308	3,351
Depreciation	289	353
Other, net	1,308	1,802
Deferred Tax Assets, Gross, Total	57,062	83,737
Deferred tax liabilities
Indefinite lived intangibles	(9,444)	(8,480)
In-process research and development	(4,374)	(4,649)
Domestic deferred tax liability on foreign NOL carryforwards	(6,836)	(10,488)
Deferred Tax Liabilities, Net	(20,654)	(23,617)
Net deferred tax assets	36,408	60,120
Valuation allowance	(2,468)	(2,418)
Net deferred tax assets	33,940	57,702
Long-term deferred tax assets, net	34,723	58,534
Long-term deferred tax liabilities	(783)	(832)
Net deferred tax assets	$ 33,940	$ 57,702