CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 377,120	$ 327,951
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,012	11,642
Share-based compensation	109,457	89,750
Deferred income taxes	(19,013)	(37,795)
Net gain on marketable securities	(7,760)	(3,854)
Non-cash operating lease costs	9,686	11,215
Provision for doubtful accounts	1,256	1,106
Gain (Loss) on Disposition of Assets	0	1,941
Net loss on sales and abandonment of property and equipment	428	555
Changes in operating assets and liabilities:
Accounts receivable	(47,683)	(65,005)
Prepaid expenses and other assets	(14,254)	(1,487)
Accounts payable	3,432	(62)
Accrued compensation and employee benefits	(9,699)	(14,931)
Other liabilities	(18,542)	(20,242)
Deferred revenue	12,046	7,964
Net cash provided by operating activities	406,486	304,866
Cash flows from investing activities:
Purchases of property and equipment	(7,130)	(3,169)
Payments to Develop Software	(11,298)	0
Proceeds from sales of marketable securities	15,855	4,969
Purchases of marketable securities	(17,861)	(8,648)
Cash transferred, net of proceeds, from product line asset sale	0	(6,126)
Net cash used in investing activities	(20,434)	(12,974)
Cash flows from financing activities:
Proceeds from revolving line of credit and term loans	795,000	339,000
Payments on revolving line of credit and term loans	(538,250)	(265,250)
Payments on finance leases	1,311	0
Proceeds from issuance of treasury stock under employee stock plans	15,680	15,615
Taxes paid related to net share settlement of equity awards	(137,223)	(75,443)
Repurchases of common stock	(498,171)	(285,158)
Net cash used in financing activities	(364,981)	(271,236)
Effect of exchange rate changes on cash	(1,806)	9,164
Increase in cash and cash equivalents	19,265	29,820
Cash and cash equivalents, beginning of period	136,778	133,202
Cash and cash equivalents, end of period	156,043	163,022
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds of $836 and $567 during the nine-month periods ended June 30, 2024 and 2023, respectively	97,281	107,081
Cash paid for interest	91,708	86,122
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	132	53
Unsettled repurchases of common stock	10,448	4,748
Finance lease obligations incurred	11,740	0
Payments on debt issuance costs	$ (706)	$ 0