Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 102,076	$ 99,930
Marketable securities	75,234	37,338
Accounts receivable, net of allowance for doubtful accounts of $313 and $971 at March 31, 2014 and 2013, respectively	60,518	73,900
Inventories	12,580	7,563
Prepaid income taxes	1,012	0
Deferred income taxes	15,846	9,538
Prepaid expenses and other current assets	11,496	9,043
Total current assets	278,762	237,312
Fixed assets, net	23,098	19,678
Goodwill	203,446	202,453
Intangible assets, net	58,513	63,827
Deferred income taxes	0	9,211
Long-term marketable securities	41,484	16,823
Other assets	2,460	2,872
Total assets	607,763	552,176
Current liabilities:
Accounts payable	11,541	10,161
Accrued compensation	34,901	31,585
Accrued other	6,430	8,256
Income taxes payable	791	114
Deferred revenue	109,301	95,055
Total current liabilities	162,964	145,171
Other long-term liabilities	2,370	2,249
Deferred tax liability	2,757	941
Accrued long-term retirement benefits	1,581	1,757
Long-term deferred revenue	24,639	25,907
Contingent liabilities, net of current portion	4,291	4,248
Total liabilities	198,602	180,273
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at March 31, 2014 and 2013	0	0
Common stock, $0.001 par value: 150,000,000 shares authorized; 49,922,959 and 49,007,491 shares issued and 41,165,784 and 41,466,921 shares outstanding at March 31, 2014 and 2013, respectively	50	49
Additional paid-in capital	273,574	253,202
Accumulated other comprehensive income	2,772	671
Treasury stock at cost, 8,757,175 and 7,540,570 shares at March 31, 2014 and 2013, respectively	(117,802)	(83,480)
Retained earnings	250,567	201,461
Total stockholders’ equity	409,161	371,903
Total liabilities and stockholders’ equity	$ 607,763	$ 552,176