Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Cash and cash equivalents	$ 299,776	$ 280,003
Short term marketable securities	22,797	18,408
Accounts receivable, net of allowance for doubtful accounts of $746 and $1,062 at March 31, 2018 and September 30, 2017, respectively	127,151	152,299
Prepaid expenses	62,094	49,913
Other current assets	137,342	165,933
Total current assets	649,160	666,556
Property and equipment, net	59,210	63,600
Goodwill	1,191,603	1,182,772
Acquired intangible assets, net	230,030	257,908
Long term marketable securities	32,467	31,907
Deferred tax assets	129,862	123,166
Other assets	36,482	34,475
Total assets	2,328,814	2,360,384
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	29,918	35,160
Accrued expenses and other current liabilities	73,631	80,761
Accrued compensation and benefits	82,544	110,957
Accrued income taxes	15,952	5,735
Deferred revenue	487,281	446,296
Total current liabilities	689,326	678,909
Long term debt	642,837	712,406
Deferred tax liabilities	5,704	17,880
Deferred revenue	10,496	12,611
Other liabilities	52,727	53,142
Total liabilities	1,401,090	1,474,948
Commitments and contingencies (Note 13)
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; 116,338 and 115,333 shares issued and outstanding at March 31, 2018 and September 30, 2017, respectively	1,163	1,153
Additional paid-in capital	1,618,588	1,609,030
Accumulated deficit	(629,597)	(650,840)
Accumulated other comprehensive loss	(62,430)	(73,907)
Total stockholders’ equity	927,724	885,436
Total liabilities and stockholders’ equity	$ 2,328,814	$ 2,360,384