Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
ASSETS
Cash and cash equivalents	$ 269,579	$ 259,946
Short-term marketable securities	27,891	25,836
Accounts receivable, net of allowance for doubtful accounts of $744 and $607 at September 30, 2019 and 2018, respectively	372,743	129,297
Prepaid expenses	52,701	48,997
Other current assets	59,707	169,708
Total current assets	782,621	633,784
Property and equipment, net	105,531	80,613
Goodwill	1,238,179	1,182,457	$ 1,182,772
Acquired intangible assets, net	169,949	200,202
Long-term marketable securities	29,544	30,115
Deferred tax assets	198,634	165,566
Other assets	140,130	36,285
Total assets	2,664,588	2,329,022
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	42,442	53,473
Accrued expenses and other current liabilities	104,028	74,388
Accrued compensation and benefits	88,769	101,784
Accrued income taxes	17,407	18,044
Deferred revenue	385,509	487,590
Total current liabilities	638,155	735,279
Long-term debt / Revolving credit facility	669,134	643,268
Deferred tax liabilities	41,683	5,589
Deferred revenue	11,123	11,852
Other liabilities	102,495	58,445
Total liabilities	1,462,590	1,454,433
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; 114,899 and 117,981 shares issued and outstanding at September 30, 2019 and 2018, respectively	1,149	1,180
Additional paid-in capital	1,502,949	1,558,403
Accumulated deficit	(191,390)	(599,409)
Accumulated other comprehensive loss	(110,710)	(85,585)
Total stockholders’ equity	1,201,998	874,589	$ 885,436	$ 842,666
Total liabilities and stockholders’ equity	$ 2,664,588	$ 2,329,022