Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 353,416	$ 369,821
Marketable securities	105,637	77,941
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $1,473 and $1,991 at June 30, 2018 and March 31, 2018, respectively	165,331	213,438
Inventories and deferred costs	32,739	34,774
Prepaid income taxes	28,544	22,932
Prepaid expenses and other current assets (related party balances of $1,651 and $3,187 at June 30, 2018 and March 31, 2018, respectively)	32,407	33,502
Total current assets	718,074	752,408
Fixed assets, net	60,006	52,511
Goodwill	1,718,499	1,712,764
Intangible assets, net	756,418	831,374
Deferred income taxes	5,575	6,685
Other assets	19,036	12,866
Total assets	3,277,608	3,368,608
Current liabilities:
Accounts payable (related party balances of $619 and $369 at June 30, 2018 and March 31, 2018, respectively)	25,122	30,133
Accrued compensation	55,331	46,552
Accrued other	30,997	33,164
Income taxes payable	210	1,526
Deferred revenue and customer deposits	248,165	301,925
Total current liabilities	359,825	413,300
Other long-term liabilities	15,092	8,308
Deferred tax liability	143,542	151,563
Accrued long-term retirement benefits	33,457	35,246
Long-term deferred revenue and customer deposits	80,491	91,409
Long-term debt	600,000	600,000
Total liabilities	1,232,407	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 June 30, 2018 and March 31, 2018	0	0
Common stock, $0.001 par value, 300,000,000 shares authorized; 118,139,282 and 117,744,913 shares issued and 80,535,277 and 80,270,023 shares outstanding at June 30, 2018 and March 31, 2018, respectively	117	117
Additional paid-in capital	2,676,382	2,665,120
Accumulated other comprehensive income (loss)	(107)	2,895
Treasury stock at cost, 37,604,005 and 37,474,890 shares at June 30, 2018 and March 31, 2018, respectively	(999,329)	(995,843)
Retained earnings	368,138	396,493
Total stockholders' equity	2,045,201	2,068,782
Total liabilities and stockholders' equity	$ 3,277,608	$ 3,368,608