Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 88,974	$ 102,076
Marketable securities	88,890	75,234
Accounts receivable, net of allowance for doubtful accounts of $263 and $313 at June 30, 2014 and March 31, 2014, respectively	32,955	60,518
Inventories	11,026	12,580
Prepaid income taxes	1,207	1,012
Deferred income taxes	14,414	15,846
Prepaid expenses and other current assets	9,328	11,496
Total current assets	246,794	278,762
Fixed assets, net	22,742	23,098
Goodwill	203,034	203,446
Intangible assets, net	56,643	58,513
Long-term marketable securities	56,580	41,484
Other assets	2,344	2,460
Total assets	588,137	607,763
Current liabilities:
Accounts payable	9,888	11,541
Accrued compensation	23,749	34,901
Accrued other	6,182	6,430
Income taxes payable	0	791
Deferred revenue	101,871	109,301
Total current liabilities	141,690	162,964
Other long-term liabilities	2,275	2,370
Deferred tax liability	2,747	2,757
Accrued long-term retirement benefits	1,582	1,581
Long-term deferred revenue	22,848	24,639
Contingent liabilities, net of current portion	4,369	4,291
Total liabilities	175,511	198,602
Commitments and contingencies (Note 11)
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at June 30, 2014 and March 31, 2014	0	0
Common stock, $0.001 par value:
150,000,000 shares authorized; 50,111,676 and 49,922,959 shares issued and 41,042,273 and 41,165,784 shares outstanding at June 30, 2014 and March 31, 2014, respectively	50	50
Additional paid-in capital	278,106	273,574
Accumulated other comprehensive income	2,416	2,772
Treasury stock at cost, 9,069,403 and 8,757,175 shares at June 30, 2014 and March 31, 2014, respectively	(129,989)	(117,802)
Retained earnings	262,043	250,567
Total stockholders’ equity	412,626	409,161
Total liabilities and stockholders’ equity	$ 588,137	$ 607,763