Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Product	$ 153,179	$ 192,010	$ 417,282	$ 525,472
Service	115,765	110,182	334,281	317,720
Total revenue	268,944	302,192	751,563	843,192
Cost of revenue:
Product (related party balances of $0, $45, $245 and $7,108, respectively)	41,327	55,296	125,013	171,770
Service (related party balances of $192, $122, $480, and $594, respectively)	23,182	26,382	80,301	81,452
Total cost of revenue	64,509	81,678	205,314	253,222
Gross profit	204,435	220,514	546,249	589,970
Operating expenses:
Research and development (related party balances of $0, $43, $3, and $1,616, respectively)	44,287	58,084	161,762	179,681
Sales and marketing (related party balances of $0, $(49), $2 and $2,423, respectively)	77,270	83,212	239,897	241,506
General and administrative (related party balances of $753, $307, $1,697 and $3,850, respectively)	23,033	28,540	82,400	90,994
Amortization of acquired intangible assets	18,221	17,515	54,902	52,646
Restructuring charges	3,363	(199)	3,821	1,730
Total operating expenses	166,174	187,152	542,782	566,557
Income from operations	38,261	33,362	3,467	23,413
Interest and other expense, net:
Interest income	307	207	1,196	627
Interest expense	(2,798)	(2,260)	(7,914)	(6,783)
Other expense	(616)	(695)	(2,847)	(1,926)
Total interest and other expense, net	(3,107)	(2,748)	(9,565)	(8,082)
Income (loss) before income tax expense (benefit)	35,154	30,614	(6,098)	15,331
Income tax expense (benefit)	(54,531)	9,369	(69,093)	4,350
Net income	$ 89,685	$ 21,245	$ 62,995	$ 10,981
Basic net income per share (in USD per share)	$ 1.03	$ 0.23	$ 0.71	$ 0.12
Diluted net income per share (in USD per share)	$ 1.02	$ 0.23	$ 0.70	$ 0.12
Weighted average common shares outstanding used in computing:
Net loss per share - basic (in shares)	87,210	91,762	88,985	92,337
Net loss per share - diluted (in shares)	87,860	92,402	89,882	92,997