CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 158,373	$ 152,528
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,017	3,535
Share-based compensation	44,269	40,654
Deferred income taxes	7,869	(5,947)
Net loss on marketable securities	2,788	1,135
Non-cash operating lease costs	2,258	2,840
Provision for (benefit from) doubtful accounts	(357)	495
Net gain on sales and abandonment of property and equipment	0	(8)
Changes in operating assets and liabilities:
Accounts receivable	39,790	57,370
Prepaid expenses and other assets	208	(19,768)
Accounts payable	(5,751)	841
Accrued compensation and employee benefits	(38,446)	(27,125)
Other liabilities	(26,663)	(26,238)
Deferred revenue	(14,273)	13,685
Net cash provided by operating activities	174,082	193,997
Cash flows from investing activities:
Purchases of property and equipment	(226)	(841)
Capitalized internal-use software costs	(8,480)	(6,330)
Proceeds from sales of marketable securities	948	375
Purchases of marketable securities	(4,976)	(2,146)
Net cash used in investing activities	(12,734)	(8,942)
Cash flows from financing activities:
Proceeds from revolving line of credit and term loans	260,000	275,000
Payments on revolving line of credit and term loans	(120,000)	(63,750)
Payments on finance leases	(66)	(22)
Proceeds from issuance of treasury stock under employee stock plans	2,132	3,261
Taxes paid related to net share settlement of equity awards	(104,379)	(196,126)
Repurchases of common stock, inclusive of excise tax	(171,169)	(162,581)
Net cash used in financing activities	(133,482)	(144,218)
Effect of exchange rate changes on cash	32	(7,250)
Increase in cash and cash equivalents	27,898	33,587
Cash and cash equivalents, beginning of period	134,136	150,667
Cash and cash equivalents, end of period	162,034	184,254
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds of $590 and $236 during the quarters ended December 31, 2025 and 2024, respectively	9,097	21,778
Cash paid for interest	78,812	43,714
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	68	229
Unsettled repurchases of common stock, inclusive of excise tax accrued, but not yet paid	$ 9,925	$ 10,559