Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 487,168	$ 467,176
Marketable securities	6,737	9,277
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $407 and $416 at June 30, 2021 and March 31, 2021, respectively	146,199	197,717
Inventories and deferred costs	20,841	22,813
Prepaid income taxes	11,534	1,906
Prepaid expenses and other current assets	23,777	23,583
Total current assets	696,256	722,472
Fixed assets, net	46,973	48,474
Operating lease right-of-use assets	58,899	61,512
Goodwill	1,716,092	1,717,554
Intangible assets, net	494,412	511,866
Deferred income taxes	8,201	8,096
Other assets	12,221	15,064
Total assets	3,033,054	3,085,038
Current liabilities:
Accounts payable	16,961	17,964
Accrued compensation	53,292	83,057
Accrued other	21,726	21,127
Income taxes payable	5,492	7,025
Deferred revenue and customer deposits	257,969	269,748
Current portion of operating lease liabilities	12,125	12,354
Total current liabilities	367,565	411,275
Other long-term liabilities	22,180	21,641
Deferred tax liability	89,591	92,287
Accrued long-term retirement benefits	40,255	39,479
Long-term deferred revenue and customer deposits	101,929	103,310
Operating lease liabilities, net of current portion	58,579	61,267
Long-term debt	350,000	350,000
Total liabilities	1,030,099	1,079,259
Commitments and contingencies (Note 12)
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at June 30, 2021 and March 31, 2021	0	0
Common stock, $0.001 par value:
300,000,000 shares authorized; 124,694,737 and 124,197,974 shares issued and 74,084,245 and 73,751,615 shares outstanding at June 30, 2021 and March 31, 2021, respectively	124	124
Additional paid-in capital	2,968,631	2,955,400
Accumulated other comprehensive loss	(1,877)	(1,940)
Treasury stock at cost, 50,610,492 and 50,446,359 shares at June 30, 2021 and March 31, 2021, respectively	(1,327,273)	(1,322,496)
Retained earnings	363,350	374,691
Total stockholders' equity	2,002,955	2,005,779
Total liabilities and stockholders' equity	$ 3,033,054	$ 3,085,038