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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Operating activities      
Net income $ 566,778 $ 394,948 $ 322,160
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation 219,108 236,650 249,216
Depreciation and amortization 106,991 112,702 115,609
Non-cash operating lease costs 33,041 38,528 38,735
Deferred income taxes (68,523) (108,521) (40,244)
Impairment of assets 0 3,455 6,175
Other (962) 1,372 1,267
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):      
Accounts receivable 63,953 16,704 (130,605)
Inventories (40,504) 32,491 (46,310)
Other current assets (14,038) (64,959) (144,628)
Other assets (91,964) 16,591 (87,008)
Accounts payable and accrued liabilities 40,368 (63,100) 19,163
Deferred revenue 22,838 81,741 191,147
Lease liabilities (44,667) (45,193) (52,046)
Net cash provided by operating activities 792,419 653,409 442,631
Investing activities      
Purchases of investments (2,100) (1,789) (61,284)
Maturities of investments 6,237 111,330 260,357
Sales of investments 0 16,085 120,578
Acquisition of businesses, net of cash acquired (32,939) (35,049) (67,911)
Purchases of property and equipment (30,412) (54,184) (33,624)
Net cash (used in) provided by investing activities (59,214) 36,393 218,116
Financing activities      
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 55,079 59,959 64,540
Payments for repurchase of common stock, including excise taxes (500,558) (350,049) (500,023)
Payments on term debt agreement 0 (350,000) (20,000)
Taxes paid related to net share settlement of equity awards (11,523) (13,209) (21,025)
Net cash used in financing activities (457,002) (653,299) (476,508)
Net increase in cash, cash equivalents and restricted cash 276,203 36,503 184,239
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations 1,302 2,125 (6,365)
Cash, cash equivalents and restricted cash, beginning of year 800,835 762,207 584,333
Cash, cash equivalents and restricted cash, end of year 1,078,340 800,835 762,207
Supplemental disclosures of cash flow information      
Cash paid for taxes, net of refunds 181,635 191,569 110,036
Cash paid for amounts included in the measurement of operating lease liabilities 53,346 52,893 58,592
Cash paid for interest on long-term debt 0 2,970 7,981
Supplemental disclosures of non-cash activities      
Right-of-use assets obtained in exchange for lease obligations $ 12,927 $ 10,544 $ 20,778