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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net income $ 153,838 $ 149,795
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 126,913 127,886
Depreciation and amortization 54,817 59,798
Non-cash operating lease costs 20,231 19,363
Deferred income taxes (49,492) (15,832)
Impairment of assets 0 6,175
Other 1,878 (439)
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):    
Accounts receivable (14,317) (72,777)
Inventories 17,620 (5,828)
Other current assets (43,547) (60,896)
Other assets 9,354 (27,893)
Accounts payable and accrued liabilities (59,534) (35,649)
Deferred revenue 102,933 99,303
Lease liabilities (22,140) (26,131)
Net cash provided by operating activities 298,554 216,875
Investing activities    
Purchases of investments (689) (53,715)
Maturities of investments 95,773 96,349
Sales of investments 16,085 78,988
Acquisition of businesses, net of cash acquired (35,006) (67,911)
Purchases of property and equipment (23,793) (15,792)
Net cash provided by investing activities 52,370 37,919
Financing activities    
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 22,461 28,628
Repurchase of common stock (40,005) (250,023)
Payments on term debt agreement (350,000) (10,000)
Taxes paid related to net share settlement of equity awards (9,825) (16,816)
Net cash used in financing activities (377,369) (248,211)
Net (decrease) increase in cash, cash equivalents and restricted cash (26,445) 6,583
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,979 (997)
Cash, cash equivalents and restricted cash, beginning of period 762,207 584,333
Cash, cash equivalents and restricted cash, end of period 738,741 589,919
Supplemental disclosures of cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities 27,200 30,346
Cash paid for interest on long-term debt 2,970 2,383
Supplemental disclosures of non-cash activities    
Right-of-use assets obtained in exchange for lease obligations $ 9,577 $ 818