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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Operating activities      
Net income $ 692,380 $ 566,778 $ 394,948
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation 231,491 219,108 236,650
Depreciation and amortization 92,399 106,991 112,702
Non-cash operating lease costs 31,503 33,041 38,528
Deferred income taxes (72,176) (68,523) (108,521)
Impairment of assets 0 0 3,455
Other 5,615 (962) 1,372
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):      
Accounts receivable (28,411) 63,953 16,704
Inventories (851) (40,504) 32,491
Other current assets (103,628) (14,038) (64,959)
Other assets (91,980) (91,964) 16,591
Accounts payable and accrued liabilities 28,899 40,368 (63,100)
Deferred revenue 200,489 22,838 81,741
Lease liabilities (36,064) (44,667) (45,193)
Net cash provided by operating activities 949,666 792,419 653,409
Investing activities      
Purchases of investments (5,720) (2,100) (1,789)
Maturities of investments 548 6,237 111,330
Sales of investments 0 0 16,085
Acquisition of businesses, net of cash acquired (171,059) (32,939) (35,049)
Purchases of property and equipment (43,260) (30,412) (54,184)
Net cash (used in) provided by investing activities (219,491) (59,214) 36,393
Financing activities      
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 59,151 55,079 59,959
Payments for repurchase of common stock, including excise taxes (502,085) (500,558) (350,049)
Payments on term debt agreement 0 0 (350,000)
Taxes paid related to net share settlement of equity awards (21,881) (11,523) (13,209)
Net cash used in financing activities (464,815) (457,002) (653,299)
Net increase in cash, cash equivalents and restricted cash 265,360 276,203 36,503
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation 2,668 1,302 2,125
Cash, cash equivalents and restricted cash, beginning of year 1,078,340 800,835 762,207
Cash, cash equivalents and restricted cash, end of year 1,346,368 1,078,340 800,835
Supplemental disclosures of cash flow information      
Cash paid for taxes, net of refunds 205,717 181,635 191,569
Cash paid for amounts included in the measurement of operating lease liabilities 44,592 53,346 52,893
Cash paid for interest on long-term debt 0 0 2,970
Supplemental disclosures of non-cash activities      
Right-of-use assets obtained in exchange for lease obligations $ 48,315 $ 12,927 $ 10,544