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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating activities    
Net income $ 311,975 $ 257,403
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 116,792 111,143
Depreciation and amortization 45,137 57,284
Non-cash operating lease costs 15,792 16,596
Deferred income taxes (39,212) (28,935)
Other 3,746 (2,829)
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):    
Accounts receivable 7,275 66,569
Inventories 8,498 (33,886)
Other current assets (53,457) (34,398)
Other assets (28,434) (16,203)
Accounts payable and accrued liabilities (33,844) (20,930)
Deferred revenue 124,640 36,855
Lease liabilities (19,529) (21,714)
Net cash provided by operating activities 459,379 386,955
Investing activities    
Purchases of investments (1,900) (1,000)
Maturities of investments 0 5,420
Acquisition of businesses, net of cash acquired (10,100) (32,939)
Purchases of property and equipment (18,576) (18,503)
Net cash used in investing activities (30,576) (47,022)
Financing activities    
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 23,871 22,557
Payments for repurchase of common stock, including excise taxes (252,068) (250,029)
Taxes paid related to net share settlement of equity awards (16,083) (8,667)
Net cash used in financing activities (244,280) (236,139)
Net increase in cash, cash equivalents and restricted cash 184,523 103,794
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,606) 1,779
Cash, cash equivalents and restricted cash, beginning of period 1,078,340 800,835
Cash, cash equivalents and restricted cash, end of period 1,261,257 906,408
Supplemental disclosures of cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities 22,828 26,169
Supplemental disclosures of non-cash activities    
Right-of-use assets obtained in exchange for lease obligations $ 36,893 $ 7,267