Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Product	$ 40,262	$ 29,531
Service	36,099	33,765
Total revenue	76,361	63,296
Cost of revenue:
Product	10,070	7,647
Service	6,793	6,249
Total cost of revenue	16,863	13,896
Gross profit	59,498	49,400
Operating expenses:
Research and development	14,077	11,320
Sales and marketing	30,149	26,772
General and administrative	6,557	6,534
Amortization of acquired intangible assets	586	482
Restructuring charges	(87)	0
Total operating expenses	51,282	45,108
Income from operations	8,216	4,292
Interest and other income (expense), net:
Interest income	116	99
Interest expense	(296)	(500)
Other income (expense), net	(176)	2
Total interest and other income (expense), net	(356)	(399)
Income before income tax expense	7,860	3,893
Income tax expense	2,852	1,494
Net income	$ 5,008	$ 2,399
Basic net income per share	$ 0.12	$ 0.06
Diluted net income per share	$ 0.12	$ 0.06
Weighted average common shares outstanding used in computing:
Net income per share - basic	41,742	42,608
Net income per share - diluted	42,453	43,343