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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Cash Flow from Operating Activities: |  |  |
Net income | $ 436,826 | $ 409,331 | $ 446,163
Reconciliation of net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 214,885 | 211,791 | 174,795
Equity-based compensation expense | 44,539 | 42,700 | 44,560
Deferred income taxes | 6,551 | (2,315) | (26,887)
Excess tax benefit from equity-based compensation | (4,666) | (6,913) | (5,949)
Loss from short-term interest-bearing investments | 9 | 407 | 476
Net changes in operating assets and liabilities, net of amounts acquired: |  |  |
Accounts receivable, net | (41,075) | (70,859) | 39,829
Prepaid expenses and other current assets | 11,002 | (11,164) | 22,690
Other noncurrent assets | (52,667) | 2,587 | 7,406
Accounts payable, accrued expenses and accrued personnel | 72,049 | 59,982 | 63,894
Deferred revenue | (50,230) | (49,828) | 2,434
Income taxes payable, net | (15,145) | 10,112 | 23,474
Other noncurrent liabilities | 14,034 | 24,403 | (20,263)
Net cash provided by operating activities | 636,112 | 620,234 | 772,622
Cash Flow from Investing Activities: |  |  |
Payments for purchase of equipment and leasehold improvements, net | (133,392) | (130,086) | (120,503)
Proceeds from sale of short-term interest-bearing investments | 278,066 | 361,960 | 252,818
Purchase of short-term interest-bearing investments | (281,983) | (370,742) | (250,184)
Net cash paid for acquisitions | (18,064) | (283,450) | (263,193)
Other | (29,940) | (18,533) | 1,408
Net cash used in investing activities | (185,313) | (440,851) | (379,654)
Cash Flow from Financing Activities: |  |  |
Borrowings under financing arrangements | 200,000 | 200,000 | 220,000
Payments under financing arrangements | (400,000) | (220,000) | (210,000)
Repurchase of shares | (340,597) | (413,422) | (454,020)
Proceeds from employee stock option exercises | 87,586 | 89,600 | 78,206
Payments of dividends | (121,503) | (109,304) | (100,790)
Excess tax benefit from equity-based compensation and other | 4,666 | 6,830 | 5,940
Net cash used in financing activities | (569,848) | (446,296) | (460,664)
Net (decrease) increase in cash and cash equivalents | (119,049) | (266,913) | (67,696)
Cash and cash equivalents at beginning of year | 768,660 | 1,035,573 | 1,103,269
Cash and cash equivalents at end of year | 649,611 | 768,660 | 1,035,573
Cash paid for: |  |  |
Income taxes, net of refunds | 67,544 | 50,407 | 51,141
Interest | $ 1,145 | $ 576 | $ 548

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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