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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 189,342 $ 155,166
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,656 13,701
Share-based compensation 57,814 53,338
Deferred income taxes 3,004 (287)
Net (gain) loss on marketable securities 3,209 (2,669)
Non-cash operating lease costs 8,166 8,005
Provision for doubtful accounts 650 266
Net loss on sales and abandonment of property and equipment 166 96
Gains on product line asset sales and business divestiture 0 (7,334)
Changes in operating assets and liabilities:    
Accounts receivable 33,098 64,304
Prepaid expenses and other assets 5,179 4,572
Accounts payable (4,105) (3,695)
Accrued compensation and employee benefits (41,745) (46,147)
Other liabilities (14,159) (9,989)
Deferred revenue (3,791) 2,143
Net cash provided by operating activities 247,484 231,470
Cash flows from investing activities:    
Purchases of property and equipment (3,293) (4,220)
Proceeds from sales of marketable securities 3,354 2,264
Purchases of marketable securities (5,982) (4,379)
Proceeds from product line asset sales and business divestiture 2,257 8,291
Purchase of equity investment 0 (210)
Net cash provided by (used in) investing activities (3,664) 1,746
Cash flows from financing activities:    
Proceeds from revolving line of credit and term loan 800,000 251,000
Payments on revolving line of credit and term loan (806,750) (121,000)
Proceeds from issuance of senior notes 550,000 0
Payments on debt issuance costs (8,819) 0
Payments on finance leases 0 (176)
Proceeds from issuance of treasury stock under employee stock plans 11,117 10,390
Taxes paid related to net share settlement of equity awards (47,849) (86,653)
Repurchases of common stock (760,861) (250,356)
Net cash used in financing activities (263,162) (196,795)
Effect of exchange rate changes on cash (1,793) 4,021
Increase (decrease) in cash and cash equivalents (21,135) 40,442
Cash and cash equivalents, beginning of period 195,354 157,394
Cash and cash equivalents, end of period 174,219 197,836
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net of refunds of $1,003 and $288 during the six-month periods ended March 31, 2022 and 2021, respectively 30,788 18,131
Cash paid for interest 21,368 18,488
Supplemental disclosures of non-cash investing and financing activities:    
Purchase of property and equipment included in accounts payable 139 388
Unsettled repurchases of common stock $ 4,735 $ 4,866