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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Cash Flow from Operating Activities:      
Net income $ 567,769 [1] $ 496,321 $ 542,962
Reconciliation of net income to net cash provided by operating activities:      
Depreciation, amortization and impairment 195,435 195,234 197,955
Amortization of debt issuance cost 608 596 579
Equity-based compensation expense 104,864 104,540 89,698
Deferred income taxes 20,291 (45,673) (60,212)
Loss from short-term interest-bearing investments 3,487 5,576 2,762
Net changes in operating assets and liabilities, net of amounts acquired:      
Accounts receivable, net 79,606 (104,413) 3,457
Prepaid expenses and other current assets (55,061) (8,478) 7,891
Other noncurrent assets (15,445) (2,250) (1,532)
Lease assets and liabilities, net 3,221 (6,485) (4,144)
Accounts payable, accrued expenses and accrued personnel (77,041) 216,324 158,876
Deferred revenue 8,172 (60,332) (157,829)
Income taxes payable, net (15,109) (47,241) (11,596)
Other noncurrent liabilities (71,701) (19,291) 53,763
Net cash provided by operating activities 749,096 724,428 822,630
Cash Flow from Investing Activities:      
Purchase of property and equipment, net [2] (103,952) (105,495) (124,362)
Proceeds from sale of short-term interest-bearing investments 169,993 68,659 25,984
Purchase of short-term interest-bearing investments 0 (9,061) 0
Net cash paid for business and intangible assets acquisitions (86,317) (86,824) (121,818)
Net cash from equity investments and other 18,215 5,315 (4,301)
Net cash used in investing activities (2,061) (127,406) (224,497)
Cash Flow from Financing Activities:      
Repurchase of shares (551,340) (563,121) (489,524)
Proceeds from employee stock option exercises 21,294 26,949 48,681
Payments of dividends (224,394) (211,967) (199,460)
Distribution to noncontrolling interests (4,039) (4,096) (1,589)
Payment of contingent consideration and deferred payment of business acquisitions (9,642) (18,782) (9,538)
Net cash used in financing activities (768,121) (771,017) (651,430)
Net decrease in cash and cash equivalents (21,086) (173,995) (53,297)
Cash and cash equivalents at beginning of year 346,085 520,080 573,377
Cash and cash equivalents at end of year 324,999 346,085 520,080
Cash paid for:      
Income taxes, net of refunds [3] 122,416 187,513 156,386
Interest $ 41,472 $ 35,396 $ 19,427
[1] or further details see Note 22 "Segment Information and Revenue from Significant Customers".
[2] The amounts under “Purchase of property and equipment, net,” include immaterial proceeds from sale of property and equipment for all periods presented.
[3] For further details, see also Note 11.