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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 flows from operating activities:      
Net income $ 86,502 $ 94,879 $ 90,095
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 33,889 32,632 33,214
Share-based compensation 45,308 36,362 25,850
Deferred income taxes (5,934) (16,026) 3,671
Tax effect from share-based payment arrangements 12,530 6,035 2,887
Excess tax benefits from share-based payment arrangements (13,795) (6,808) (6,362)
Net amortization of premium on marketable securities 0 0 8
Provision of doubtful accounts 0 1,485 327
Net (gain) loss on sales of property and equipment 2,210 (10) 351
Changes in operating assets and liabilities:      
Accounts receivable (4,602) (13,649) 1,286
Prepaid expenses and other assets (15,462) (1,754) (822)
Accounts payable (3,672) 3,174 (590)
Accrued compensation and employee benefits (1,506) 17,450 (11,729)
Other liabilities 4,113 15,566 1,823
Deferred revenue (6,604) 5,698 (3,889)
Net cash provided by operating activities 132,977 175,034 136,120
Cash flows from investing activities:      
Purchases of property and equipment (24,999) (12,590) (24,147)
Proceeds from maturities of marketable securities 0 0 22,000
Cash paid for acquisitions, net of cash acquired (56,992) (7,253) (32,874)
Distribution from cost method investees 75 0 50
Net cash used in investing activities (81,916) (19,843) (34,971)
Cash flows from financing activities:      
Proceeds from revolving line of credit 249,000 145,000 30,000
Payments on revolving line of credit and other short-term loans (116,000) (61,000) (18,676)
Payments on senior notes (71,000) (8,000) (49,000)
Proceeds from issuance of treasury stock under employee stock plans 18,258 18,851 40,107
Taxes paid related to net share settlement of equity awards (19,461) (12,297) (9,851)
Dividends paid (2,508) (2,714) (2,824)
Repurchases of common stock (130,719) (217,039) (82,752)
Excess tax benefits from share-based payment arrangements 13,795 6,808 6,362
Net cash used in financing activities (58,635) (130,391) (86,634)
Effect of exchange rate changes on cash (11,381) (2,903) (2,946)
Increase (decrease) in cash and cash equivalents (18,955) 21,897 11,569
Cash and cash equivalents, beginning of year 105,075 83,178 71,609
Cash and cash equivalents, end of year 86,120 105,075 83,178
Supplemental disclosures of cash flow information:      
Cash paid for income taxes, net of refunds of $1,592, $3,424 and $2,471 during the years ended September 30, 2015, 2014 and 2013, respectively 33,752 22,367 24,141
Cash paid for interest 30,470 28,209 31,011
Supplemental disclosures of non-cash investing and financing activities:      
Unsettled repurchases of common stock 0 0 2,141
Purchase of property and equipment included in accounts payable $ 436 $ 363 $ 681