CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 117,236	$ 128,428
Marketable securities	27,905	30,435
Accounts receivable, net of allowances of $181 and $395	37,765	45,560
Deferred costs	5,894	6,095
Prepaid expenses and other current assets	92,352	76,530
Total current assets	281,152	287,048
Long-term marketable securities	7,720	7,339
Property and equipment, net	34,437	31,505
Deferred costs	29,882	31,702
Operating lease right of use assets	16,525	14,901
Goodwill	1,125,648	1,128,511
Intangible assets, net	20,138	25,348
Deferred tax assets	157,833	159,293
Other assets	19,090	20,081
Total assets	1,692,425	1,705,728
Current liabilities:
Accounts payable	8,322	11,636
Deferred revenue	71,215	78,394
Short-term operating lease liabilities	5,386	4,562
Short-term debt	6,250	6,250
Accrued expenses and other current liabilities	50,309	64,467
Total current liabilities	141,482	165,309
Long-term debt	264,831	265,093
Deferred revenue, net of current portion	193,443	198,343
Long-term operating lease liabilities	12,998	12,216
Other liabilities	30,170	32,822
Total liabilities	642,924	673,783
Commitments and contingencies (Note 12)
Stockholders' Equity:
Common stock, $0.01 par value, 560,000 shares authorized; 39,162 and 38,025 shares issued and outstanding, respectively	392	381
Accumulated other comprehensive (loss) income	(3,717)	1,634
Additional paid-in capital	1,006,205	1,002,353
Retained earnings	46,621	27,577
Total stockholders' equity	1,049,501	1,031,945
Total liabilities and stockholders' equity	$ 1,692,425	$ 1,705,728