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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 306,364 $ 177,285
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 20,066 23,549
Share-based compensation 84,099 68,197
Deferred income taxes (11,064) (1,230)
Net gain on marketable securities (4,706) (998)
Non-cash operating lease costs 12,056 14,962
Provision for doubtful accounts, net 551 2,777
Net loss on sales and abandonment of property and equipment 107 61
Gains on product line asset sales and business divestiture (100,139) 0
Changes in operating assets and liabilities:    
Accounts receivable 56,655 (18,961)
Prepaid expenses and other assets 5,172 (9,734)
Accounts payable (4,165) (1,815)
Accrued compensation and employee benefits (24,990) (10,147)
Other liabilities (5,388) (12,330)
Deferred revenue (2,556) (2,886)
Net cash provided by operating activities 332,062 228,730
Cash flows from investing activities:    
Purchases of property and equipment (5,792) (21,073)
Proceeds from sales of marketable securities 2,294 3,462
Purchases of marketable securities (5,121) (5,790)
Proceeds from product line asset sales and business divestiture 146,428 0
(Purchase of) distribution from equity investment (210) 55
Net cash provided by (used in) investing activities 137,599 (23,346)
Cash flows from financing activities:    
Proceeds from revolving line of credit 429,000 193,000
Payments on revolving line of credit (208,000) (435,000)
Proceeds from issuance of senior notes 0 350,000
Payments on debt issuance costs 0 (6,840)
Payments on finance leases (177) (811)
Proceeds from issuance of treasury stock under employee stock plans 14,580 26,235
Taxes paid related to net share settlement of equity awards (88,770) (100,067)
Repurchases of common stock including prepayment under accelerated share repurchase agreement (541,205) (210,000)
Net cash used in financing activities (394,572) (183,483)
Effect of exchange rate changes on cash 5,129 (2,654)
Increase in cash and cash equivalents 80,218 19,247
Cash and cash equivalents, beginning of period 157,394 106,426
Cash and cash equivalents, end of period 237,612 125,673
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds of $289 and $1,552 during the nine months ended June 30, 2021, and 2020, respectively 34,465 5,723
Interest Paid, Excluding Capitalized Interest, Operating Activities 36,764 34,844
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 564 50
Finance lease obligations incurred $ 0 $ 6,489