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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Cash Flow from Operating Activities:      
Net income $ 446,163 $ 422,122 $ 412,439
Reconciliation of net income to net cash provided by operating activities:      
Depreciation and amortization 174,795 162,772 140,776
Equity-based compensation expense 44,560 44,578 40,340
Deferred income taxes (26,887) (6,510) 12,485
Excess tax benefit from equity-based compensation (5,949) (3,925) (366)
Loss from short-term interest-bearing investments 476 1,023 2,269
Net changes in operating assets and liabilities, net of amounts acquired:      
Accounts receivable, net 39,829 5,540 29,999
Prepaid expenses and other current assets 22,690 (1,769) (86)
Other noncurrent assets 7,406 7,434 29,384
Accounts payable, accrued expenses and accrued personnel 63,894 73,949 (4,104)
Deferred revenue 2,434 (1,967) (15,078)
Income taxes payable, net 23,474 1,106 (5,268)
Other noncurrent liabilities (20,263) 4,905 27,757
Net cash provided by operating activities 772,622 709,258 670,547
Cash Flow from Investing Activities:      
Payments for purchase of equipment and leasehold improvements, net (120,503) (111,569) (106,724)
Proceeds from sale of short-term interest-bearing investments 252,818 379,484 311,677
Purchase of short-term interest-bearing investments (250,184) (389,800) (386,876)
Net cash paid for acquisitions (263,193) (180,540) (112,405)
Other 1,408 3,872 (2,801)
Net cash used in investing activities (379,654) (298,553) (297,129)
Cash Flow from Financing Activities:      
Borrowings under financing arrangements 220,000 210,000 200,000
Payments under financing arrangements (210,000) (200,000) (200,000)
Repurchase of shares (454,020) (372,014) (367,061)
Proceeds from employee stock option exercises 78,206 128,125 213,430
Payments of dividends (100,790) (90,939) (84,008)
Excess tax benefit from equity-based compensation 5,949 3,925 366
Other (9) (725) (1,111)
Net cash used in financing activities (460,664) (321,628) (238,384)
Net (decrease) increase in cash and cash equivalents (67,696) 89,077 135,034
Cash and cash equivalents at beginning of year 1,103,269 1,014,192 879,158
Cash and cash equivalents at end of year 1,035,573 1,103,269 1,014,192
Cash paid for:      
Income taxes, net of refunds 51,141 59,216 38,441
Interest $ 548 $ 628 $ 468