Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Product	$ 546,127	$ 735,531	$ 633,408
Service	440,660	426,581	322,011
Total revenue	986,787	1,162,112	955,419
Cost of revenue:
Product (related party balances of $245, $7,229 and $25,055, respectively)	164,526	238,002	238,037
Service (related party balances of $665, $745 and $5,736, respectively)	107,379	108,137	90,412
Total cost of revenue	271,905	346,139	328,449
Gross profit	714,882	815,973	626,970
Operating expenses:
Research and development (related party balances of $3, $1,624 and $16,701, respectively)	215,076	232,701	208,630
Sales and marketing (related party balances of $2, $2,423 and $15,430, respectively)	312,536	328,628	293,335
General and administrative (related party balances of $1,703, $4,099 and $16,055, respectively)	109,479	118,438	117,714
Amortization of acquired intangible assets	76,640	70,141	32,373
Restructuring charges	5,209	4,001	468
Total operating expenses	718,940	753,909	652,520
Income (loss) from operations	(4,058)	62,064	(25,550)
Interest and other income (expense), net:
Interest income	1,808	1,021	691
Interest expense	(12,633)	(9,184)	(6,329)
Other income (expense), net (related party balances of $56, $426 and ($379), respectively)	(3,776)	(1,716)	(1,251)
Total interest and other expense, net	(14,601)	(9,879)	(6,889)
Income (loss) before income tax expense (benefit)	(18,659)	52,185	(32,439)
Income tax expense (benefit)	(98,471)	18,894	(4,070)
Net income (loss)	$ 79,812	$ 33,291	$ (28,369)
Basic net income (loss) per share (in dollars per share)	$ 0.91	$ 0.36	$ (0.35)
Diluted net income (loss) per share (in dollars per share)	$ 0.90	$ 0.36	$ (0.35)
Weighted average common shares outstanding used in computing:
Net income (loss) per share-basic (in shares)	87,425	92,226	81,927
Net income (loss) per share-diluted (in shares)	88,261	92,920	81,927