Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Current assets:
Cash and cash equivalents	$ 403,306	$ 338,489
Marketable securities	23,202	47,969
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $853 and $1,350 at June 30, 2020 and March 31, 2020, respectively	138,793	213,514
Inventories and deferred costs	27,300	22,227
Prepaid income taxes	12,392	13,505
Prepaid expenses and other current assets	25,782	24,039
Total current assets	630,775	659,743
Fixed assets, net	55,228	57,715
Operating lease right-of-use assets	68,025	68,583
Goodwill	1,721,649	1,725,680
Intangible assets, net	569,477	582,179
Deferred income taxes	6,491	6,220
Long-term marketable securities	0	2,613
Other assets	15,882	17,770
Total assets	3,067,527	3,120,503
Current liabilities:
Accounts payable	17,288	20,004
Accrued compensation	53,688	75,632
Accrued other	25,875	21,840
Income taxes payable	233	903
Deferred revenue and customer deposits	249,382	270,281
Current portion of operating lease liabilities	11,026	10,337
Total current liabilities	357,492	398,997
Other long-term liabilities	14,449	10,039
Deferred tax liability	111,194	114,394
Accrued long-term retirement benefits	35,120	34,256
Long-term deferred revenue and customer deposits	100,100	104,240
Operating lease liabilities, net of current portion	69,355	70,658
Long-term debt	450,000	450,000
Total liabilities	1,137,710	1,182,584
Commitments and contingencies (Note 14)
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at June 30, 2020 and March 31, 2020	0	0
Common stock, $0.001 par value:
300,000,000 shares authorized; 122,353,504 and 122,006,077 shares issued and 72,455,170 and 72,220,906 shares outstanding at June 30, 2020 and March 31, 2020, respectively	122	122
Additional paid-in capital	2,903,055	2,891,553
Accumulated other comprehensive loss	(2,241)	(3,160)
Treasury stock at cost, 49,898,334 and 49,785,171 shares at June 30, 2020 and March 31, 2020, respectively	(1,309,038)	(1,305,935)
Retained earnings	337,919	355,339
Total stockholders' equity	1,929,817	1,937,919
Total liabilities and stockholders' equity	$ 3,067,527	$ 3,120,503