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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net income $ 257,403 $ 153,838
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 111,143 126,913
Depreciation and amortization 57,284 54,817
Non-cash operating lease costs 16,596 20,231
Deferred income taxes (28,935) (49,492)
Other (2,829) 1,878
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):    
Accounts receivable 66,569 (14,317)
Inventories (33,886) 17,620
Other current assets (34,398) (43,547)
Other assets (16,203) 9,354
Accounts payable and accrued liabilities (20,930) (59,534)
Deferred revenue 36,855 102,933
Lease liabilities (21,714) (22,140)
Net cash provided by operating activities 386,955 298,554
Investing activities    
Purchases of investments (1,000) (689)
Maturities of investments 5,420 95,773
Sales of investments 0 16,085
Acquisition of businesses, net of cash acquired (32,939) (35,006)
Purchases of property and equipment (18,503) (23,793)
Net cash (used in) provided by investing activities (47,022) 52,370
Financing activities    
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 22,557 22,461
Payments for repurchase of common stock (250,029) (40,005)
Payments on term debt agreement 0 (350,000)
Taxes paid related to net share settlement of equity awards (8,667) (9,825)
Net cash used in financing activities (236,139) (377,369)
Net increase (decrease) in cash, cash equivalents and restricted cash 103,794 (26,445)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1,779 2,979
Cash, cash equivalents and restricted cash, beginning of period 800,835 762,207
Cash, cash equivalents and restricted cash, end of period 906,408 738,741
Supplemental disclosures of cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities 26,169 27,200
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 $ 7,267 $ 9,577