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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net income | $ 86,492 | $ 54,921
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 7,026 | 7,856
Share-based compensation | 25,132 | 23,145
Deferred income taxes | (298) | (1,016)
Net gain on marketable securities | (1,768) | (944)
Non-cash operating lease costs | 4,000 | 4,493
Provision for doubtful accounts, net | 219 | 281
Net loss on sales and abandonment of property and equipment | 62 | 48
Gain on sale of product line assets | (7,334) | 0
Changes in operating assets and liabilities: |  |
Accounts receivable | 33,130 | 22,391
Prepaid expenses and other assets | (7,310) | (21,711)
Accounts payable | (1,479) | 10,349
Accrued compensation and employee benefits | (46,704) | (35,566)
Other liabilities | (12,241) | (4,379)
Deferred revenue | (980) | 497
Net cash provided by operating activities | 77,947 | 60,365
Cash flows from investing activities: |  |
Purchases of property and equipment | (3,045) | (6,500)
Proceeds from sales of marketable securities | 567 | 167
Purchases of marketable securities | (1,741) | (2,733)
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 | 3,862 | (9,011)
Cash flows from financing activities: |  |
Proceeds from revolving line of credit | 116,000 | 117,000
Payments on revolving line of credit | (80,000) | (367,000)
Proceeds from issuance of senior notes | 0 | 350,000
Payments on debt issuance costs | 0 | (6,805)
Payments on finance leases | (176) | (425)
Proceeds from issuance of treasury stock under employee stock plans | 57 | 5,091
Taxes paid related to net share settlement of equity awards | (85,678) | (86,047)
Repurchases of common stock | (50,011) | (60,009)
Net cash used in financing activities | (99,808) | (48,195)
Effect of exchange rate changes on cash | 5,267 | 1,631
Increase (decrease) in cash and cash equivalents | (12,732) | 4,790
Cash and cash equivalents, beginning of period | 157,394 | 106,426
Cash and cash equivalents, end of period | 144,662 | 111,216
Supplemental disclosures of cash flow information: |  |
Cash paid for income taxes, net of refunds of $221 and $154 during the quarters ended December 31, 2020, and 2019, respectively | 3,186 | 2,391
Interest Paid, Excluding Capitalized Interest, Operating Activities | 17,858 | 12,856
Supplemental disclosures of non-cash investing and financing activities: |  |
Purchase of property and equipment included in accounts payable | 13 | 93
Finance lease obligations incurred | $ 0 | $ 3,045

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