CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Assets, Current [Abstract]
Cash and cash equivalents	$ 1,357,664	$ 826,525
Short-term investments	644,003	744,485
Restricted cash and cash equivalents	546,604	565,461
Accounts receivable, net of allowances of $443 and $995 at March 31, 2020 and 2019, respectively	592,555	395,729
Inventory	19,108	28,200
Software development costs and licenses	40,316	28,880
Deferred cost of goods sold	19,598	51,867
Prepaid expenses and other	273,503	186,688
Total current assets	3,493,351	2,827,835
Fixed assets, net	131,888	127,882
Right-of-use assets	154,284	0
Software development costs and licenses, net of current portion	401,778	603,436
Goodwill	386,494	381,717
Other intangibles, net	51,260	73,115
Deferred tax assets	116,676	134,732
Long-term restricted cash and cash equivalents	89,124	0
Other assets	123,977	94,348
Total assets	4,948,832	4,243,065
Current liabilities:
Accounts payable	65,684	72,797
Accrued expenses and other current liabilities	1,169,884	1,035,695
Deferred revenue	777,784	843,302
Lease liabilities	25,187	0
Total current liabilities	2,038,539	1,951,794
Non-current deferred revenue	28,339	21,058
Non-current lease liabilities	152,059	0
Other long-term liabilities	190,651	229,633
Total liabilities	2,409,588	2,202,485
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 5,000 shares authorized: no shares issued and outstanding at March 31, 2020 and 2019	0	0
Common stock, $0.01 par value, 200,000 shares authorized; 135,927 and 134,602 shares issued and 113,506 and 112,181 outstanding at March 31, 2020 and 2019, respectively	1,359	1,346
Additional paid-in capital	2,134,748	2,019,369
Treasury stock, at cost; 22,421 common shares at March 31, 2020 and 2019, respectively	(820,572)	(820,572)
Retained earnings	1,282,085	877,626
Accumulated other comprehensive loss	(58,376)	(37,189)
Total stockholders' equity	2,539,244	2,040,580
Total liabilities and stockholders' equity	$ 4,948,832	$ 4,243,065