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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net income $ 496,932 $ 377,120
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,931 10,012
Share-based compensation 124,288 109,457
Deferred income taxes (19,427) (19,013)
Net gain on marketable securities (1,629) (7,760)
Non-cash operating lease costs 7,426 9,686
Provision for doubtful accounts 1,485 1,256
Net loss on sales and abandonment of property and equipment 93 428
Changes in operating assets and liabilities:    
Accounts receivable (32,784) (47,683)
Prepaid expenses and other assets (25,094) (14,254)
Accounts payable 4,276 3,432
Accrued compensation and employee benefits (9,656) (9,699)
Other liabilities (16,580) (18,542)
Deferred revenue 14,877 12,046
Net cash provided by operating activities 555,138 406,486
Cash flows from investing activities:    
Purchases of property and equipment (4,751) (7,130)
Payments to Develop Software (21,831) (11,298)
Proceeds from sales of marketable securities 1,856 15,855
Purchases of marketable securities (5,664) (17,861)
Net cash used in investing activities (30,390) (20,434)
Cash flows from financing activities:    
Proceeds from revolving line of credit and term loans 450,000 795,000
Payments on revolving line of credit and term loans (1,368,750) (538,250)
Proceeds from issuance of senior notes 1,500,000 0
Payments on debt issuance costs (17,163) (706)
Payments on finance leases (3,079) (1,311)
Proceeds from issuance of treasury stock under employee stock plans 21,908 15,680
Taxes paid related to net share settlement of equity awards (203,188) (137,223)
Repurchases of common stock (866,520) (498,171)
Net cash used in financing activities (486,792) (364,981)
Effect of exchange rate changes on cash 426 (1,806)
Increase in cash and cash equivalents 38,382 19,265
Cash and cash equivalents, beginning of period 150,667 136,778
Cash and cash equivalents, end of period 189,049 156,043
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds of $3,442 and $836 during the nine-month periods ended June 30, 2025 and 2024, respectively 129,078 97,281
Cash paid for interest 101,112 91,708
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 2,600 132
Unsettled repurchases of common stock 24,935 10,448
Finance lease obligations incurred $ 0 $ 11,740