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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities    
Net income $ 93,559 $ 87,678
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 63,757 58,069
Depreciation and amortization 30,260 27,660
Non-cash operating lease costs 9,663 9,698
Deferred income taxes (6,407) (694)
Impairment of assets 6,175 6,873
Other (1,123) 307
Changes in operating assets and liabilities (excluding effects of the acquisition of businesses):    
Accounts receivable (77,223) (54,416)
Inventories 1,260 1,443
Other current assets (44,286) (23,250)
Other assets (21,774) (26,654)
Accounts payable and accrued liabilities (25,387) (23,925)
Deferred revenue 76,065 86,193
Lease liabilities (14,173) (11,619)
Net cash provided by operating activities 90,366 137,363
Investing activities    
Purchases of investments (36,205) (42,765)
Maturities of investments 38,138 69,352
Sales of investments 34,549 0
Acquisition of businesses, net of cash acquired (67,911) (1,247)
Purchases of property and equipment (10,564) (4,697)
Net cash (used in) provided by investing activities (41,993) 20,643
Financing activities    
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan 27,581 27,196
Payments for Repurchase of Common Stock (125,011) 0
Payments on term debt agreement (5,000) (5,000)
Cost of Issuance of Treasury Stock (13,595) (4,481)
Net cash (used in) provided by financing activities (116,025) 17,715
Net (decrease) increase in cash, cash equivalents and restricted cash (67,652) 175,721
Effect of exchange rate changes on cash, cash equivalents and restricted cash (861) 1,655
Cash, cash equivalents and restricted cash, beginning of period 584,333 852,826
Cash, cash equivalents and restricted cash, end of period 515,820 1,030,202
Supplemental disclosures of cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities 16,500 15,032
Cash paid for interest on long-term debt 1,252 1,370
Supplemental disclosures of non-cash activities    
Right-of-use assets obtained in exchange for lease obligations $ 818 $ 1,614