Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 94,352	$ 104,893
Marketable securities	112,857	101,392
Accounts receivable, net of allowance for doubtful accounts of $142 and $173 at June 30, 2015 and March 31, 2015, respectively	58,496	82,226
Inventories	12,710	12,130
Prepaid income taxes	0	1,393
Deferred income taxes	21,053	21,755
Prepaid expenses and other current assets	8,425	13,495
Total current assets	307,893	337,284
Fixed assets, net	24,902	23,864
Goodwill	198,222	197,445
Intangible assets, net	48,815	50,180
Long-term marketable securities	60,303	58,572
Other assets	1,617	1,704
Total assets	641,752	669,049
Current liabilities:
Accounts payable	11,203	13,077
Accrued compensation	21,780	36,553
Accrued other	7,509	14,474
Income taxes payable	147	107
Deferred revenue	108,179	123,422
Total current liabilities	148,818	187,633
Other long-term liabilities	1,858	1,995
Deferred tax liability	10,653	10,639
Accrued long-term retirement benefits	1,589	1,587
Long-term deferred revenue	27,919	26,961
Contingent liabilities, net of current portion	4,521	4,484
Total liabilities	$ 195,358	$ 233,299
Commitments and contingencies (Note 10)
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at June 30, 2015 and March 31, 2015	$ 0	$ 0
Common stock, $0.001 par value:
150,000,000 shares authorized; 50,834,158 and 50,812,548 shares issued and 40,752,954 and 40,807,805 shares outstanding at June 30, 2015 and March 31, 2015, respectively	51	51
Additional paid-in capital	302,456	298,101
Accumulated other comprehensive loss	(2,858)	(4,645)
Treasury stock at cost, 10,081,204 and 10,004,743 shares at June 30, 2015 and March 31, 2015, respectively	(172,683)	(169,516)
Retained earnings	319,428	311,759
Total stockholders’ equity	446,394	435,750
Total liabilities and stockholders’ equity	$ 641,752	$ 669,049