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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

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