Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
ASSETS
Cash and cash equivalents	$ 259,946	$ 280,003
Short-term marketable securities	25,836	18,408
Accounts receivable, net of allowance for doubtful accounts of $607 and $1,062 at September 30, 2018 and 2017, respectively	129,297	152,299
Prepaid expenses	48,997	49,913
Other current assets	169,708	165,933
Total current assets	633,784	666,556
Property and equipment, net	80,613	63,600
Goodwill	1,182,457	1,182,772
Acquired intangible assets, net	200,202	257,908
Long-term marketable securities	30,115	31,907
Deferred tax assets	165,566	123,166
Other assets	36,285	34,475
Total assets	2,329,022	2,360,384
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	53,473	35,160
Accrued expenses and other current liabilities	74,388	80,761
Accrued compensation and benefits	101,784	110,957
Accrued income taxes	18,044	5,735
Deferred revenue	487,590	446,296
Total current liabilities	735,279	678,909
Long-term debt, net of current portion	643,268	712,406
Deferred tax liabilities	5,589	17,880
Deferred revenue	11,852	12,611
Other liabilities	58,445	53,142
Total liabilities	1,454,433	1,474,948
Commitments and contingencies (Note I)
Stockholders’ equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 500,000 shares authorized; 117,981 and 115,333 shares issued and outstanding at September 30, 2018 and 2017, respectively	1,180	1,153
Additional paid-in capital	1,558,403	1,609,030
Accumulated deficit	(599,409)	(650,840)
Accumulated other comprehensive loss	(85,585)	(73,907)
Total stockholders’ equity	874,589	885,436
Total liabilities and stockholders’ equity	$ 2,329,022	$ 2,360,384