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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Operating activities      
Net income $ 394,948 $ 322,160 $ 331,241
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation 236,650 249,216 243,279
Depreciation and amortization 112,702 115,609 115,424
Non-cash operating lease costs 38,528 38,735 38,375
Deferred income taxes (108,521) (40,244) (76,930)
Impairment of assets 3,455 6,175 40,698
Other 1,372 1,267 737
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):      
Accounts receivable 16,704 (130,605) (46,289)
Inventories 32,491 (46,310) 5,843
Other current assets (64,959) (144,628) (84,328)
Other assets 16,591 (87,008) (110,653)
Accounts payable and accrued liabilities (63,100) 19,163 22,933
Deferred revenue 81,741 191,147 216,431
Lease liabilities (45,193) (52,046) (51,565)
Net cash provided by operating activities 653,409 442,631 645,196
Investing activities      
Purchases of investments (1,789) (61,284) (472,165)
Maturities of investments 111,330 260,357 197,279
Sales of investments 16,085 120,578 271,521
Acquisition of businesses, net of cash acquired (35,049) (67,911) (411,319)
Purchases of property and equipment (54,184) (33,624) (30,651)
Net cash provided by (used in) investing activities 36,393 218,116 (445,335)
Financing activities      
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 59,959 64,540 65,752
Repurchase of common stock (350,049) (500,023) (500,000)
Payments on term debt agreement (350,000) (20,000) (20,000)
Taxes paid related to net share settlement of equity awards (13,209) (21,025) (14,032)
Net cash used in financing activities (653,299) (476,508) (468,280)
Net increase (decrease) in cash, cash equivalents and restricted cash 36,503 184,239 (268,419)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations 2,125 (6,365) (74)
Cash, cash equivalents and restricted cash, beginning of year 762,207 584,333 852,826
Cash, cash equivalents and restricted cash, end of year 800,835 762,207 584,333
Supplemental disclosures of cash flow information      
Cash paid for taxes, net of refunds 191,569 110,036 99,378
Cash paid for amounts included in the measurement of operating lease liabilities 52,893 58,592 61,504
Cash paid for interest on long-term debt 2,970 7,981 5,280
Supplemental disclosures of non-cash activities      
Right-of-use assets obtained in exchange for lease obligations $ 10,544 $ 20,778 $ 13,051