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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net income $ 660,003 $ 496,932
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,123 10,931
Share-based compensation 141,910 124,288
Deferred income taxes 25,693 (19,427)
Net gain on marketable securities (2,765) (1,629)
Non-cash operating lease costs 7,158 7,426
Provision for doubtful accounts 0 1,485
Net loss on sales and abandonment of property and equipment 26 93
Changes in operating assets and liabilities:    
Accounts receivable (50,766) (32,784)
Prepaid expenses and other assets (1,370) (25,094)
Accounts payable (5,538) 4,276
Accrued compensation and employee benefits (4,419) (9,656)
Other liabilities (21,107) (16,580)
Deferred revenue 16,932 14,877
Net cash provided by operating activities 777,880 555,138
Cash flows from investing activities:    
Purchases of property and equipment (1,355) (4,751)
Capitalized internal-use software costs (26,491) (21,831)
Proceeds from sales of marketable securities 16,566 1,856
Purchases of marketable securities (15,186) (5,664)
Purchases of other investments (12,810) 0
Net cash used in investing activities (39,276) (30,390)
Cash flows from financing activities:    
Proceeds from revolving line of credit and term loans 2,950,000 450,000
Payments on revolving line of credit and term loans (1,015,000) (1,368,750)
Proceeds from issuance of senior notes 1,000,000 1,500,000
Payments on senior notes (400,000) 0
Payments on debt issuance costs (12,063) (17,163)
Payments on finance leases (2,950) (3,079)
Proceeds from issuance of treasury stock under employee stock plans 14,935 21,908
Taxes paid related to net share settlement of equity awards (111,275) (203,188)
Repurchases of common stock, inclusive of excise tax and prepayment under accelerated share repurchase agreement (3,045,992) (866,520)
Net cash used in financing activities (622,345) (486,792)
Effect of exchange rate changes on cash (1,951) 426
Increase in cash and cash equivalents 114,308 38,382
Cash and cash equivalents, beginning of period 134,136 150,667
Cash and cash equivalents, end of period 248,444 189,049
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds of $8,538 and $3,442 during the nine-month periods ended June 30, 2026 and 2025, respectively 162,882 129,078
Cash paid for interest 162,420 101,112
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 213 2,600
Unsettled repurchases of common stock, inclusive of excise tax accrued, but not yet paid $ 25,318 $ 24,935