CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 18,568	$ 32,104
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	13,574	14,947
Benefit from credit loss reserve	(418)	(261)
Stock-based compensation	16,767	27,469
Non-cash interest expense	2,595	2,454
Deferred tax benefit	(2,162)	(7,653)
Other	2,504	(1,481)
Changes in operating assets and liabilities:
Accounts receivable	(3,557)	(8,206)
Prepaid expenses and other assets	(36,354)	(7,608)
Deferred costs	2,896	3,835
Accounts payable	6,293	(4,129)
Accrued expenses and other liabilities	(2,115)	(2,970)
Deferred revenue	(11,848)	(21,492)
Net cash provided by operating activities	6,743	27,009
Cash flows from investing activities:
Capital expenditures	(9,985)	(5,181)
Purchases of marketable securities	(13,115)	(9,067)
Sale and maturities of marketable securities	16,453	2,700
Payments for equity investments	(584)	(2,563)
Other investing activities	1,266	264
Net cash used in investing activities	(5,965)	(13,847)
Cash flows from financing activities:
Payments for long-term debt issuance costs		(520)
Principal payments of long-term debt	(3,126)	(3,126)
Common stock repurchases for tax withholdings for net settlement of equity awards	(46,423)	(32,200)
Principal payment of lease liabilities arising from a finance lease	(246)	(238)
Proceeds from the issuance of common stock	33,459	5,045
Net cash used in financing activities	(16,336)	(31,039)
Effects of exchange rate changes on cash and cash equivalents	(1,051)	1,356
Net change in cash and cash equivalents	(16,609)	(16,521)
Cash and cash equivalents at beginning of period	128,428	136,067
Cash and cash equivalents at end of period	111,819	119,546
Supplemental information:
Cash paid for income taxes	6,594	1,446
Cash paid for interest	$ 4,151	$ 5,403