Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 369,054	$ 369,821
Marketable securities	105,753	77,941
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $1,705 and $1,991 at December 31, 2018 and March 31, 2018, respectively	247,690	213,438
Inventories and deferred costs	28,909	34,774
Prepaid income taxes	23,826	22,932
Prepaid expenses and other current assets (related party balances of $336 and $3,187 at December 31, 2018 and March 31, 2018, respectively)	27,001	33,502
Total current assets	802,233	752,408
Fixed assets, net	60,789	52,511
Goodwill	1,715,523	1,712,764
Intangible assets, net	693,763	831,374
Deferred income taxes	4,776	6,685
Long-term marketable securities	1,002	0
Other assets	19,298	12,866
Total assets	3,297,384	3,368,608
Current liabilities:
Accounts payable (related party balances of $601 and $369 at December 31, 2018 and March 31, 2018, respectively)	29,432	30,133
Accrued compensation	71,612	46,552
Accrued other	24,185	33,164
Income taxes payable	210	1,526
Deferred revenue and customer deposits	260,926	301,925
Total current liabilities	386,365	413,300
Other long-term liabilities	20,057	8,308
Deferred tax liability	129,284	151,563
Accrued long-term retirement benefits	33,320	35,246
Long-term deferred revenue and customer deposits	84,881	91,409
Long-term debt	600,000	600,000
Total liabilities	1,253,907	1,299,826
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; no shares issued or outstanding at December 31, 2018 and March 31, 2018	0	0
Common stock, $0.001 par value, 300,000,000 shares authorized; 119,417,029 and 117,744,913 shares issued and 77,831,786 and 80,270,023 shares outstanding at December 31, 2018 and March 31, 2018, respectively	119	117
Additional paid-in capital	2,809,901	2,665,120
Accumulated other comprehensive income (loss)	(608)	2,895
Treasury stock at cost, 41,585,243 and 37,474,890 shares at December 31, 2018 and March 31, 2018, respectively	(1,104,042)	(995,843)
Retained earnings	338,107	396,493
Total stockholders' equity	2,043,477	2,068,782
Total liabilities and stockholders' equity	$ 3,297,384	$ 3,368,608