Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Assets
Cash and cash equivalents	$ 117,255	$ 67,168
Marketable securities	79,617	133,430
Accounts receivable, net of allowance for doubtful accounts of $226 and $346 at March 31, 2012 and 2011, respectively	69,795	62,801
Inventories	8,021	8,925
Prepaid income taxes	4,600	3,205
Deferred income taxes	4,237	3,383
Prepaid expenses and other current assets	6,162	4,814
Total current assets	289,687	283,726
Fixed assets, net	16,457	13,467
Goodwill	170,384	128,177
Intangible assets, net	54,685	47,686
Deferred income taxes	17,892	25,167
Long-term marketable securities	16,644	27,880
Other assets	2,008	1,467
Total assets	567,757	527,570
Liabilities and Stockholders' Equity
Accounts payable	7,539	9,709
Accrued compensation	23,050	21,854
Accrued other	6,235	4,786
Current portion of long-term debt	0	15,000
Current portion of contingent liabilities	3,774	0
Deferred revenue	93,493	85,241
Total current liabilities	134,091	136,590
Other long-term liabilities	2,347	1,721
Deferred tax liability	1,410	0
Accrued long-term retirement benefits	1,990	1,859
Long-term deferred revenue	18,722	14,735
Long-term debt, net of current portion	62,000	53,106
Contingent liabilities, net of current portion	4,828	0
Total liabilities	225,388	208,011
Commitments and contingencies (Note 17)
Stockholders' equity:
Preferred stock, $0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at March 31, 2012 and 2011	0	0
Common stock, $0.001 par value: 150,000,000 shares authorized; 48,185,731 and 47,441,879 shares issued and 41,814,191 and 42,557,221 shares outstanding at March 31, 2012 and 2011, respectively	48	47
Additional paid-in capital	237,289	227,201
Accumulated other comprehensive income (loss)	212	(676)
Treasury stock at cost, 6,371,540 and 4,884,658 shares at March 31, 2012 and 2011, respectively	(56,032)	(35,437)
Retained earnings	160,852	128,424
Total stockholders' equity	342,369	319,559
Total liabilities and stockholders' equity	$ 567,757	$ 527,570