Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
ASSETS
Cash and cash equivalents	$ 280,003	$ 277,935
Short-term marketable securities	18,408	18,695
Accounts receivable, net of allowance for doubtful accounts of $1,062 and $1,012 at September 30, 2017 and 2016, respectively	152,299	161,357
Prepaid expenses	49,913	52,819
Other current assets	165,933	131,783
Total current assets	666,556	642,589
Property and equipment, net	63,600	67,113
Goodwill	1,182,772	1,169,813
Acquired intangible assets, net	257,908	310,305
Long-term marketable securities	31,907	30,921
Deferred tax assets	123,166	89,692
Other assets	34,475	35,296
Total assets	2,360,384	2,345,729
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	35,160	18,022
Accrued expenses and other current liabilities	80,761	84,141
Accrued compensation and benefits	110,957	145,633
Accrued income taxes	5,735	6,303
Deferred revenue	446,296	400,420
Total current liabilities	678,909	654,519
Long-term debt, net of current portion	712,406	751,601
Deferred tax liabilities	17,880	13,754
Deferred revenue	12,611	13,237
Other liabilities	53,142	69,952
Total liabilities	1,474,948	1,503,063
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; 115,333 and 114,968 shares issued and outstanding at September 30, 2017 and 2016, respectively	1,153	1,150
Additional paid-in capital	1,609,030	1,598,548
Accumulated deficit	(650,840)	(657,079)
Accumulated other comprehensive loss	(73,907)	(99,953)
Total stockholders’ equity	885,436	842,666
Total liabilities and stockholders’ equity	$ 2,360,384	$ 2,345,729