Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
ASSETS
Cash and cash equivalents	$ 365,756	$ 275,458
Short-term marketable securities	0	28,129
Accounts receivable, net of allowance for doubtful accounts of $368 and $543 at June 30, 2021 and September 30, 2020, respectively	432,980	415,221
Prepaid expenses	73,542	69,408
Other current assets	46,218	45,231
Total current assets	918,496	833,447
Property and equipment, net	93,659	101,499
Goodwill	2,197,313	1,625,786
Acquired intangible assets, net	394,682	237,570
Long-term marketable securities	0	30,970
Deferred tax assets	178,087	190,963
Operating right-of-use lease assets	147,431	149,933
Other assets	276,551	212,570
Total assets	4,206,219	3,382,738
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	23,446	24,910
Accrued expenses and other current liabilities	114,570	96,313
Accrued compensation and benefits	111,897	101,087
Accrued income taxes	10,326	7,011
Deferred revenue	460,836	416,804
Short-term lease obligations	25,124	34,635
Total current liabilities	746,199	680,760
Long-term debt	1,478,927	1,005,314
Deferred tax liabilities	11,541	12,431
Deferred revenue	12,777	9,661
Long-term lease obligations	178,009	180,388
Other liabilities	53,808	55,936
Total liabilities	2,481,261	1,944,490
Commitments and contingencies (Note 15)
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; 117,280 and 116,125 shares issued and outstanding at June 30, 2021 and September 30, 2020, respectively	1,173	1,161
Additional paid-in capital	1,694,902	1,602,728
Retained earnings (accumulated deficit)	121,713	(62,267)
Accumulated other comprehensive loss	(92,830)	(103,374)
Total stockholders’ equity	1,724,958	1,438,248
Total liabilities and stockholders’ equity	$ 4,206,219	$ 3,382,738