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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating activities    
Net income $ 138,382 $ 72,402
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 56,002 62,874
Depreciation and amortization 29,266 27,472
Non-cash operating lease costs 8,392 10,167
Deferred income taxes (11,203) (25,070)
Other 722 358
Changes in operating assets and liabilities:    
Accounts receivable (58,713) (15,837)
Inventories 34 9,168
Other current assets (32,164) (20,602)
Other assets 2,949 (1,252)
Accounts payable and accrued liabilities (13,447) (19,981)
Deferred revenue 54,990 68,540
Lease liabilities (9,892) (10,608)
Net cash provided by operating activities 165,318 157,631
Investing activities    
Purchases of investments (1,000) (680)
Maturities of investments 2,913 63,519
Sales of investments 0 12,167
Purchases of property and equipment (9,048) (13,104)
Net cash (used in) provided by investing activities (7,135) 61,902
Financing activities    
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 21,876 22,180
Payments for repurchase of common stock (150,018) (40,005)
Payments on term debt agreement 0 (350,000)
Taxes paid related to net share settlement of equity awards (6,830) (7,037)
Net cash used in financing activities (134,972) (374,862)
Net increase (decrease) in cash, cash equivalents and restricted cash 23,211 (155,329)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,264 3,079
Cash, cash equivalents and restricted cash, beginning of period 800,835 762,207
Cash, cash equivalents and restricted cash, end of period 826,310 609,957
Supplemental disclosures of cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities 12,982 13,665
Cash paid for interest on long-term debt 0 2,970
Supplemental disclosures of non-cash activities    
Right-of-use assets obtained in exchange for lease obligations $ 4,846 $ 6,193