Condensed Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011
Assets
Cash and cash equivalents	$ 39,473	$ 67,168
Marketable securities	142,319	133,430
Accounts receivable, net of allowance for doubtful accounts of $233 and $346 at June 30, 2011 and March 31, 2011, respectively	41,361	62,801
Inventories	9,591	8,925
Prepaid income taxes	5,376	3,205
Deferred income taxes	3,379	3,383
Prepaid expenses and other current assets	4,765	4,814
Total current assets	246,264	283,726
Fixed assets, net	14,629	13,467
Goodwill	141,356	128,177
Intangible assets, net	50,500	47,686
Deferred income taxes	24,920	25,167
Long-term marketable securities	27,442	27,880
Other assets	1,359	1,467
Total assets	506,470	527,570
Liabilities and Stockholders' Equity
Accounts payable	6,579	9,709
Accrued compensation	14,152	21,854
Accrued other	3,826	4,786
Current portion of long-term debt	15,000	15,000
Deferred revenue	78,618	85,241
Total current liabilities	118,175	136,590
Other long-term liabilities	1,887	1,721
Accrued long-term retirement benefits	1,914	1,859
Long-term deferred revenue	12,197	14,735
Long-term debt, net of current portion	49,356	53,106
Total liabilities	183,529	208,011
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value:5,000,000 shares authorized; no shares issued or outstanding at June 30, 2011 and March 31, 2011	0	0
Common stock, $0.001 par value:150,000,000 shares authorized; 47,679,986 and 47,441,879 shares issued and 42,726,605 and 42,557,319 shares outstanding at June 30, 2011 and March 31, 2011, respectively	48	47
Additional paid-in capital	229,515	227,201
Accumulated other comprehensive loss	(582)	(676)
Treasury stock at cost, 4,953,381 and 4,884,560 shares at June 30, 2011 and March 31, 2011, respectively	(36,863)	(35,437)
Retained earnings	130,823	128,424
Total stockholders' equity	322,941	319,559
Total liabilities and stockholders' equity	$ 506,470	$ 527,570