Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 548,105	$ 467,176
Marketable securities	5,349	9,277
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $220 and $416 at December 31, 2021 and March 31, 2021, respectively	233,854	197,717
Inventories and deferred costs	21,500	22,813
Prepaid income taxes	4,355	1,906
Prepaid expenses and other current assets	26,425	23,583
Total current assets	839,588	722,472
Fixed assets, net	42,723	48,474
Operating lease right-of-use assets	56,268	61,512
Goodwill	1,720,713	1,717,554
Intangible assets, net	453,719	511,866
Deferred income taxes	7,817	8,096
Other assets	12,721	15,064
Total assets	3,133,549	3,085,038
Current liabilities:
Accounts payable	18,436	17,964
Accrued compensation	67,332	83,057
Accrued other	31,821	21,127
Income taxes payable	5,382	7,025
Deferred revenue and customer deposits	296,814	269,748
Current portion of operating lease liabilities	11,441	12,354
Total current liabilities	431,226	411,275
Other long-term liabilities	7,499	21,641
Deferred tax liability	80,763	92,287
Accrued long-term retirement benefits	38,576	39,479
Long-term deferred revenue and customer deposits	122,227	103,310
Operating lease liabilities, net of current portion	55,671	61,267
Long-term debt	350,000	350,000
Total liabilities	1,085,962	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 December 31, 2021 and March 31, 2021	0	0
Common stock, $0.001 par value:
300,000,000 shares authorized; 126,137,308 and 124,197,974 shares issued and 73,828,546 and 73,751,615 shares outstanding at December 31, 2021 and March 31, 2021, respectively	126	124
Additional paid-in capital	3,003,679	2,955,400
Accumulated other comprehensive loss	(1,795)	(1,940)
Treasury stock at cost, 52,308,762 and 50,446,359 shares at December 31, 2021 and March 31, 2021, respectively	(1,373,394)	(1,322,496)
Retained earnings	418,971	374,691
Total stockholders' equity	2,047,587	2,005,779
Total liabilities and stockholders' equity	$ 3,133,549	$ 3,085,038