Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 409,632	$ 369,821
Marketable securities	76,344	77,941
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $1,583 and $1,991 at March 31, 2019 and 2018, respectively	235,318	213,438
Inventories and deferred costs	26,270	34,774
Prepaid income taxes	18,000	22,932
Prepaid expenses and other current assets (related party balances of $335 and $3,187 at March 31, 2019 and 2018, respectively)	35,658	33,502
Total current assets	801,222	752,408
Fixed assets, net	58,951	52,511
Goodwill	1,715,485	1,712,764
Intangible assets, net	669,118	831,374
Deferred income taxes	7,218	6,685
Long-term marketable securities	1,012	0
Other assets	16,988	12,866
Total assets	3,269,994	3,368,608
Current liabilities:
Accounts payable (related party balances of $244 and $369 at March 31, 2019 and 2018, respectively)	24,582	30,133
Accrued compensation	58,501	46,552
Accrued other	23,027	33,164
Income taxes payable	1,318	1,526
Deferred revenue and customer deposits	272,508	301,925
Total current liabilities	379,936	413,300
Other long-term liabilities	19,493	8,308
Deferred tax liability	124,229	151,563
Accrued long-term retirement benefits	36,284	35,246
Long-term deferred revenue and customer deposits	94,619	91,409
Long-term debt	550,000	600,000
Total liabilities	1,204,561	1,299,826
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock, $0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at March 31, 2019 and 2018	0	0
Common stock, $0.001 par value: 300,000,000 shares authorized; 119,760,132 and 117,744,913 shares issued and 77,610,361 and 80,270,023 shares outstanding at March 31, 2019 and 2018, respectively	120	117
Additional paid-in capital	2,828,922	2,665,120
Accumulated other comprehensive income (loss)	(2,639)	2,895
Treasury stock at cost, 42,149,771 and 37,474,890 shares at March 31, 2019 and 2018, respectively	(1,119,063)	(995,843)
Retained earnings	358,093	396,493
Total stockholders’ equity	2,065,433	2,068,782
Total liabilities and stockholders’ equity	$ 3,269,994	$ 3,368,608