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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 155,166 $ 113,209
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,701 15,535
Share-based compensation 53,338 45,933
Deferred income taxes (287) (1,213)
Net (gain) loss on marketable securities (2,669) 2,526
Non-cash operating lease costs 8,005 10,000
Provision for doubtful accounts, net 266 2,459
Net loss on sales and abandonment of property and equipment 96 59
Gain on sale of product line assets (7,334) 0
Changes in operating assets and liabilities:    
Accounts receivable 64,304 (13,823)
Prepaid expenses and other assets 4,572 (19,656)
Accounts payable (3,695) 1,833
Accrued compensation and employee benefits (46,147) (37,339)
Other liabilities (9,989) (4,659)
Deferred revenue 2,143 6,995
Net cash provided by operating activities 231,470 121,859
Cash flows from investing activities:    
Purchases of property and equipment (4,220) (13,166)
Proceeds from sales of marketable securities 2,264 3,385
Purchases of marketable securities (4,379) (5,232)
Proceeds from sale of product line assets 8,291 0
(Purchase of) distribution from equity investment (210) 55
Net cash provided by (used in) investing activities 1,746 (14,958)
Cash flows from financing activities:    
Proceeds from revolving line of credit 251,000 156,000
Payments on revolving line of credit (121,000) (377,000)
Proceeds from issuance of senior notes 0 350,000
Payments on debt issuance costs 0 (6,840)
Payments on finance leases (176) (712)
Proceeds from issuance of treasury stock under employee stock plans 10,390 23,216
Taxes paid related to net share settlement of equity awards (86,653) (97,000)
Repurchases of common stock (250,356) (148,008)
Net cash used in financing activities (196,795) (100,344)
Effect of exchange rate changes on cash 4,021 (4,017)
Increase in cash and cash equivalents 40,442 2,540
Cash and cash equivalents, beginning of period 157,394 106,426
Cash and cash equivalents, end of period 197,836 108,966
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds of $288 and $1,538 during the six months ended March 31, 2021, and 2020, respectively 18,131 4,475
Interest Paid, Excluding Capitalized Interest, Operating Activities 18,488 16,181
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 388 1,920
Unsettled repurchases of common stock 4,866 8,002
Finance lease obligations incurred $ 0 $ 5,148