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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 flows from operating activities:      
Net income $ 128,256 $ 109,448 $ 86,502
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 36,214 31,633 33,889
Share-based compensation 61,222 55,509 45,308
Deferred income taxes (6,049) (26,007) (5,934)
Tax effect from share-based payment arrangements 0 24,184 12,530
Provision of doubtful accounts 1,640 2,011 0
Net loss on sales of property and equipment 14 6 2,210
Changes in operating assets and liabilities:      
Accounts receivable (1,265) (18,225) (4,602)
Prepaid expenses and other assets (7,115) 12,848 (15,462)
Accounts payable (2,027) 564 (3,672)
Accrued compensation and employee benefits 6,464 17,079 (1,506)
Other liabilities (683) (4,282) 4,113
Deferred revenue 8,973 5,500 (6,604)
Net cash provided by operating activities 225,644 210,268 146,772
Cash flows from investing activities:      
Purchases of property and equipment (19,828) (21,969) (24,999)
Cash paid for acquisitions, net of cash acquired 0 (5,683) (56,992)
Distribution from (purchase of) cost method investees (777) 37 75
Net cash used in investing activities (20,605) (27,615) (81,916)
Cash flows from financing activities:      
Proceeds from revolving line of credit 190,000 122,000 249,000
Payments on revolving line of credit (84,000) (99,000) (116,000)
Payments on senior notes (72,000) (60,000) (71,000)
Proceeds from issuance of treasury stock under employee stock plans 14,474 17,828 18,258
Taxes paid related to net share settlement of equity awards (40,232) (29,955) (19,461)
Dividends paid (1,238) (2,489) (2,508)
Repurchases of common stock (187,629) (138,399) (130,719)
Net cash used in financing activities (180,625) (190,015) (72,430)
Effect of exchange rate changes on cash 5,278 (2,832) (11,381)
Increase (decrease) in cash and cash equivalents 29,692 (10,194) (18,955)
Cash and cash equivalents, beginning of year 75,926 86,120 105,075
Cash and cash equivalents, end of year 105,618 75,926 86,120
Supplemental disclosures of cash flow information:      
Cash paid for income taxes, net of refunds of $3,757, $11,363 and $1,592 during the years ended September 30, 2017, 2016 and 2015, respectively 31,315 10,855 33,752
Cash paid for interest 26,083 26,884 30,470
Supplemental disclosures of non-cash investing and financing activities:      
Unsettled Repurchases Of Common Stock 5,661 0 0
Purchase of property and equipment included in accounts payable $ 1,751 $ 3,287 $ 436