Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
ASSETS
Cash and cash equivalents	$ 173,367	$ 277,935
Short term marketable securities	22,738	18,695
Accounts receivable, net of allowance for doubtful accounts of $1,348 and $1,012 at December 31, 2016 and September 30, 2016, respectively	132,853	161,357
Prepaid expenses	62,981	52,819
Other current assets	121,249	131,783
Total current assets	513,188	642,589
Property and equipment, net	65,885	67,113
Goodwill	1,159,492	1,169,813
Acquired intangible assets, net	293,727	310,305
Long term marketable securities	27,096	30,921
Deferred tax assets	93,394	89,692
Other assets	44,159	35,296
Total assets	2,196,941	2,345,729
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	19,063	18,022
Accrued expenses and other current liabilities	77,291	84,141
Accrued compensation and benefits	88,574	145,633
Accrued income taxes	6,873	6,303
Deferred revenue	364,929	400,420
Total current liabilities	556,730	654,519
Long term debt	731,762	751,601
Deferred tax liabilities	14,889	13,754
Deferred revenue	10,100	13,237
Other liabilities	64,495	69,952
Total liabilities	1,377,976	1,503,063
Commitments and contingencies (Note 14)
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; 115,606 and 114,968 shares issued and outstanding at December 31, 2016 and September 30, 2016, respectively	1,156	1,150
Additional paid-in capital	1,597,886	1,598,548
Accumulated deficit	(666,220)	(657,079)
Accumulated other comprehensive loss	(113,857)	(99,953)
Total stockholders’ equity	818,965	842,666
Total liabilities and stockholders’ equity	$ 2,196,941	$ 2,345,729