Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 636,161	$ 467,176
Marketable securities	67,037	9,277
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $1,649 and $416 at March 31, 2022 and 2021, respectively	148,245	197,717
Inventories and deferred costs	28,220	22,813
Prepaid income taxes	9,349	1,906
Prepaid expenses and other current assets	32,927	23,583
Total current assets	921,939	722,472
Fixed assets, net	41,337	48,474
Operating lease right-of-use assets	54,996	61,512
Goodwill	1,723,156	1,717,554
Intangible assets, net	433,419	511,866
Deferred income taxes	6,883	8,096
Other assets	12,979	15,064
Total assets	3,194,709	3,085,038
Current liabilities:
Accounts payable	21,959	17,964
Accrued compensation	75,788	83,057
Accrued other	32,064	21,127
Income taxes payable	4,353	7,025
Deferred revenue and customer deposits	330,585	269,748
Current portion of operating lease liabilities	11,411	12,354
Total current liabilities	476,160	411,275
Other long-term liabilities	7,470	21,641
Deferred tax liability	78,899	92,287
Accrued long-term retirement benefits	34,737	39,479
Long-term deferred revenue and customer deposits	133,121	103,310
Operating lease liabilities, net of current portion	53,927	61,267
Long-term debt	350,000	350,000
Total liabilities	1,134,314	1,079,259
Commitments and contingencies (Note 19)
Stockholders’ equity:
Preferred stock, $0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at March 31, 2022 and 2021	0	0
Common stock, $0.001 par value: 300,000,000 shares authorized; 126,425,383 and 124,197,974 shares issued and 74,102,293 and 73,751,615 shares outstanding at March 31, 2022 and 2021, respectively	126	124
Additional paid-in capital	3,023,403	2,955,400
Accumulated other comprehensive income (loss)	141	(1,940)
Treasury stock at cost, 52,323,090 and 50,446,359 shares at March 31, 2022 and 2021, respectively	(1,373,840)	(1,322,496)
Retained earnings	410,565	374,691
Total stockholders’ equity	2,060,395	2,005,779
Total liabilities and stockholders’ equity	$ 3,194,709	$ 3,085,038