Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 332,183	$ 369,821
Marketable securities	119,935	77,941
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $1,209 and $1,991 at September 30, 2018 and March 31, 2018, respectively	184,156	213,438
Inventories and deferred costs	30,985	34,774
Prepaid income taxes	25,143	22,932
Prepaid expenses and other current assets (related party balances of $1,468 and $3,187 at September 30, 2018 and March 31, 2018, respectively)	27,429	33,502
Total current assets	719,831	752,408
Fixed assets, net	63,617	52,511
Goodwill	1,712,962	1,712,764
Intangible assets, net	720,949	831,374
Deferred income taxes	5,640	6,685
Other assets	20,006	12,866
Total assets	3,243,005	3,368,608
Current liabilities:
Accounts payable (related party balances of $366 and $369 at September 30, 2018 and March 31, 2018, respectively)	22,102	30,133
Accrued compensation	54,258	46,552
Accrued other	32,364	33,164
Income taxes payable	210	1,526
Deferred revenue and customer deposits	230,098	301,925
Total current liabilities	339,032	413,300
Other long-term liabilities	20,449	8,308
Deferred tax liability	135,738	151,563
Accrued long-term retirement benefits	34,053	35,246
Long-term deferred revenue and customer deposits	77,135	91,409
Long-term debt	600,000	600,000
Total liabilities	1,206,407	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 September 30, 2018 and March 31, 2018	0	0
Common stock, $0.001 par value, 300,000,000 shares authorized; 119,231,287 and 117,744,913 shares issued and 77,704,724 and 80,270,023 shares outstanding at September 30, 2018 and March 31, 2018, respectively	119	117
Additional paid-in capital	2,796,695	2,665,120
Accumulated other comprehensive income	555	2,895
Treasury stock at cost, 41,526,563 and 37,474,890 shares at September 30, 2018 and March 31, 2018, respectively	(1,102,481)	(995,843)
Retained earnings	341,710	396,493
Total stockholders' equity	2,036,598	2,068,782
Total liabilities and stockholders' equity	$ 3,243,005	$ 3,368,608