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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:      
Net income $ 429,375 $ 373,541 $ 392,084
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,638 20,465 25,592
Share-based compensation 123,847 115,355 112,457
Deferred income taxes (47,378) 7,816 (5,955)
Non-cash operating lease costs 14,708 15,922 16,102
Provision of doubtful accounts 1,475 2,800 652
Net (gain) loss on marketable securities (2,908) 9,269 (4,569)
Net loss on sales and abandonment of property and equipment 547 193 333
Gains on product line asset sales and business divestiture (1,941) 0 (100,139)
Changes in operating assets and liabilities:      
Accounts receivable (70,117) (31,557) 24,496
Prepaid expenses and other assets (11,904) 7,368 (5,722)
Accounts payable 2,236 (2,802) (2,354)
Accrued compensation and employee benefits 4,631 (3,637) (13,144)
Other liabilities (7,057) (28,830) (20,502)
Deferred revenue 18,763 23,547 4,486
Net cash provided by operating activities 468,915 509,450 423,817
Cash flows from investing activities:      
Purchases of property and equipment (4,237) (6,029) (7,569)
Proceeds from sales of marketable securities 5,032 8,063 7,237
Purchases of marketable securities (10,623) (9,963) (9,039)
Proceeds from Sale of Productive Assets   2,258 147,431
Payments (Proceeds) from Sale of Other Productive Assets (6,126)    
Purchase of equity investment 0 0 (210)
Net cash provided by (used in) investing activities (15,954) (5,671) 137,850
Cash flows from financing activities:      
Proceeds from revolving line of credit and term loan 407,000 1,039,000 682,000
Payments on revolving line of credit and term loan (402,000) (988,250) (259,000)
Proceeds from issuance of senior notes 0 550,000 0
Payments on debt issuance costs 0 (8,819) (1,488)
Payments on finance leases 0 0 (176)
Proceeds from issuance of treasury stock under employee stock plans 22,198 16,026 20,881
Taxes paid related to net share settlement of equity awards (76,673) (50,942) (91,609)
Repurchases of common stock (405,526) (1,104,180) (874,179)
Net cash used in financing activities (455,001) (547,165) (523,571)
Increase (decrease) in cash and cash equivalents 3,576 (62,152) 37,960
Cash and cash equivalents, beginning of year 133,202 195,354 157,394
Cash and cash equivalents, end of year 136,778 133,202 195,354
Supplemental disclosures of cash flow information:      
Cash paid for income taxes, refunds 640 1,090 464
Income Taxes Paid, Net 152,775 65,332 71,486
Cash paid for interest 96,877 57,208 37,955
Supplemental disclosures of non-cash investing and financing activities:      
Unsettled repurchases of common stock 1,821 0 8,043
Purchase of property and equipment included in accounts payable 106 22 71
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 5,616 $ (18,766) $ (136)