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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |  |
Net income | $ 192,124 | $ 126,482 | $ 133,414
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 31,612 | 30,182 | 36,214
Share-based compensation | 82,973 | 74,814 | 61,222
Deferred income taxes | 7,701 | 10,584 | (6,248)
Provision of doubtful accounts | 518 | 623 | 1,640
Net gain (loss) on marketable securities | 761 | (1,449) | 0
Gain on sale of cost-method investment | 0 | (10,000) | 0
Net loss on sales of property and equipment | 127 | 231 | 14
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (36,176) | (8,266) | 2,858
Prepaid expenses and other assets | (55,507) | (9,790) | (9,863)
Accounts payable | 1,885 | 843 | (2,027)
Accrued compensation and employee benefits | 22,380 | 7,352 | 6,464
Other liabilities | 1,463 | 6,246 | (81)
Deferred revenue | 10,489 | (4,800) | 2,037
Net cash provided by operating activities | 260,350 | 223,052 | 225,644
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (23,981) | (31,299) | (19,828)
Proceeds from sales of marketable securities | 3,480 | 3,230 | 0
Purchases of marketable securities | (6,404) | (6,050) | 0
Proceeds from Sale and Maturity of Other Investments | 0 | 20,000 | 0
Payments to Acquire Other Investments | 0 | 0 | (777)
Cash paid for acquisitions, net of cash acquired | (15,855) | 0 | 0
Net cash used in investing activities | (42,760) | (14,119) | (20,605)
Cash flows from financing activities: |  |  |
Proceeds from revolving line of credit | 229,000 | 427,000 | 190,000
Payments on revolving line of credit | (141,000) | (531,000) | (84,000)
Proceeds from issuance of senior notes | 0 | 400,000 | 0
Payments on senior notes | (28,000) | (131,000) | (72,000)
Payments on debt issuance costs | 0 | (7,849) | 0
Repayments of Long-term Capital Lease Obligations | (945) | 0 | 0
Proceeds from issuance of treasury stock under employee stock plans | 22,788 | 11,023 | 14,474
Taxes paid related to net share settlement of equity awards | (52,996) | (44,205) | (40,232)
Dividends paid | 0 | 0 | (1,238)
Repurchases of common stock | (228,894) | (342,596) | (187,629)
Net cash used in financing activities | (200,047) | (218,627) | (180,625)
Effect of exchange rate changes on cash | (1,140) | (5,901) | 5,278
Increase (decrease) in cash and cash equivalents | 16,403 | (15,595) | 29,692
Cash and cash equivalents, beginning of year | 90,023 | 105,618 | 75,926
Cash and cash equivalents, end of year | 106,426 | 90,023 | 105,618
Supplemental disclosures of cash flow information: |  |  |
Cash paid for income taxes, net of refunds of $1,372, $3,079 and $3,757 during the years ended September 30, 2019, 2018 and 2017, respectively | 18,779 | 13,398 | 31,315
Cash paid for interest | 39,924 | 26,106 | 26,083
Supplemental disclosures of non-cash investing and financing activities: |  |  |
Capital Lease Obligation Incurred | 5,803 | 0 | 0
Unsettled repurchases of common stock | 0 | 0 | 5,661
Purchase of property and equipment included in accounts payable | $ 1,448 | $ 1,913 | $ 1,751

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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