Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets
Net operating loss and tax credit carryforwards	$ 62,835	$ 48,724
Stock-based compensation	15,488	13,271
Nondeductible reserves and accruals	9,739	8,290
Foreign net operating loss carryforwards	7,360	9,598
Deferred revenue	3,677	3,770
Depreciation and amortization	485	826
Other, net	128	822
Deferred Tax Assets, Gross, Total	99,712	85,301
Deferred tax liabilities
Goodwill	(7,136)	(6,787)
In-process research and development	(4,593)	(5,045)
Depreciation	(2,175)	(1,011)
Basis differences on other investments	(7,146)
Domestic deferred tax liability on foreign net operating loss carryforwards	(680)	(963)
Deferred Tax Liabilities, Net	(21,730)	(13,806)
Net deferred tax assets	77,982	71,495
Valuation allowance	(1,302)	(1,652)
Net deferred tax assets	76,680	69,843
Long-term deferred tax assets, net	77,502	70,746
Long-term deferred tax liabilities	(822)	(903)
Net deferred tax assets	$ 76,680	$ 69,843