CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 58,276	$ 61,538
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,196	25,160
Share-based compensation	25,631	18,897
Deferred income taxes	(7,576)	(5,515)
Tax effect from share-based payment arrangements	5,844	2,245
Excess tax benefits from share-based payment arrangements	(5,934)	(5,073)
Net amortization of premium on marketable securities	0	8
Provision for doubtful accounts, net	998	293
Net loss on sales of property and equipment	3	393
Changes in operating assets and liabilities:
Accounts receivable	(9,934)	9,977
Prepaid expenses and other assets	1,206	1,841
Accounts payable	1,622	4,987
Accrued compensation and employee benefits	2,976	(12,897)
Other liabilities	5,532	(1,213)
Deferred revenue	973	(464)
Net cash provided by operating activities	103,813	100,177
Cash flows from investing activities:
Purchases of property and equipment	(7,088)	(20,435)
Proceeds from maturities of marketable securities	0	22,000
Cash paid for acquisitions, net of cash acquired	(7,253)	(32,874)
Distribution from cost method investees	0	50
Net cash used in investing activities	(14,341)	(31,259)
Cash flows from financing activities:
Proceeds from revolving line of credit	96,000	30,000
Payments on revolving line of credit and other short-term loans	(28,000)	(3,676)
Payments on senior notes	(8,000)	(49,000)
Proceeds from issuance of treasury stock under employee stock plans	7,251	23,790
Dividends paid	(2,074)	(2,123)
Repurchases of common stock	(152,329)	(47,811)
Excess tax benefits from share-based payment arrangements	5,934	5,073
Net cash used in financing activities	(81,218)	(43,747)
Effect of exchange rate changes on cash	1,677	(3,761)
Increase in cash and cash equivalents	9,931	21,410
Cash and cash equivalents, beginning of period	83,178	71,609
Cash and cash equivalents, end of period	93,109	93,019
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	17,174	23,139
Cash paid for interest	21,468	24,480
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	708	1,533
Unsettled repurchases of common stock	$ 8,846	$ 0