Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 30, 2014	Nov. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 55,860us-gaap_NetIncomeLoss	$ 52,178us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	8,216	8,763
Stock-based compensation expense	5,277us-gaap_ShareBasedCompensation	5,116us-gaap_ShareBasedCompensation
Deferred income taxes	341	(679)
Loss (gain) on sale of assets	24us-gaap_GainLossOnDispositionOfAssets	(23)us-gaap_GainLossOnDispositionOfAssets
Tax benefits from share-based payment arrangements	(2,458)	(2,144)
Changes in assets and liabilities, net of effects of an acquisition
Accounts receivable, net of reserves	1,627	(2,612)
Accounts payable and accrued expenses	4,548	(316)
Accrued compensation	(23,061)	(21,213)
Deferred fees	(1,696)	(94)
Taxes payable, net of prepaid taxes	23,667	19,108
Prepaid expenses and other assets	(1,011)	3,036
Deferred rent and other non-current liabilities	(166)	(3,280)
Other working capital accounts, net	0	299
Net cash provided by operating activities	71,168	58,139
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired	0	(15,288)
Purchases of investments	(12,437)us-gaap_PaymentsToAcquireInvestments	(7,172)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales of investments	7,535	6,871
Purchases of property, equipment and leasehold improvements, net of proceeds from dispositions	(4,814)	(5,438)
Net cash used in investing activities	(9,716)	(21,027)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividend payments	(16,184)us-gaap_PaymentsOfDividends	(15,064)us-gaap_PaymentsOfDividends
Repurchase of common stock	(50,539)	(60,062)
Proceeds from employee stock plans	7,381us-gaap_ProceedsFromStockPlans	9,484us-gaap_ProceedsFromStockPlans
Tax benefits from share-based payment arrangements	2,458	2,144
Net cash used in financing activities	(56,884)	(63,498)
Effect of exchange rate changes on cash and cash equivalents	(5,711)	3,780
Net decrease in cash and cash equivalents	(1,143)	(22,606)
Cash and cash equivalents at beginning of period	116,378	196,627
Cash and cash equivalents at end of period	$ 115,235	$ 174,021

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-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ 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 (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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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=31042434&loc=d3e3602-108585

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