Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Product	$ 57,953	$ 52,357	$ 122,319	$ 95,334
Service	45,646	39,740	89,132	78,568
Total revenue	103,599	92,097	211,451	173,902
Cost of revenue:
Product	12,939	11,810	26,705	21,583
Service	8,656	7,894	17,486	15,043
Total cost of revenue	21,595	19,704	44,191	36,626
Gross profit	82,004	72,393	167,260	137,276
Operating expenses:
Research and development	19,241	16,638	38,008	32,603
Sales and marketing	32,196	31,559	69,468	63,759
General and administrative	11,067	7,457	19,820	14,438
Amortization of acquired intangible assets	856	857	1,718	1,711
Total operating expenses	63,360	56,511	129,014	112,511
Income from operations	18,644	15,882	38,246	24,765
Interest and other income (expense), net:
Interest income	98	57	202	144
Interest expense	(196)	(187)	(390)	(377)
Other income (expense), net	(445)	71	(486)	101
Total interest and other income (expense), net	(543)	(59)	(674)	(132)
Income before income tax expense	18,101	15,823	37,572	24,633
Income tax expense	6,868	5,940	14,863	9,497
Net income	$ 11,233	$ 9,883	$ 22,709	$ 15,136
Basic net income per share (in USD per share)	$ 0.27	$ 0.24	$ 0.55	$ 0.37
Diluted net income per share (in USD per share)	$ 0.27	$ 0.24	$ 0.54	$ 0.36
Weighted average common shares outstanding used in computing:
Net income per share - basic (in shares)	41,060	41,392	41,071	41,398
Net income per share - diluted (in shares)	41,652	41,950	41,732	42,004