Derivative Instruments (Summary Of Hedging Positions And Corresponding Fair Values) (Details) (USD $) In Thousands	Aug. 31, 2011	Aug. 31, 2010
Derivative [Line Items]
Gross Notional Value	$ 8,618	$ 73,345
Fair Value Asset (Liability)	897	(341)
British Pound Sterling / U.S. Dollar [Member]
Derivative [Line Items]
Gross Notional Value	0	30,978
Fair Value Asset (Liability)	0	879
Euro / U.S. Dollar [Member]
Derivative [Line Items]
Gross Notional Value	8,422	42,367
Fair Value Asset (Liability)	916	(1,220)
Japanese Yen / U.S. Dollar [Member]
Derivative [Line Items]
Gross Notional Value	196	0
Fair Value Asset (Liability)	$ (19)	$ 0

Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Name:	us-gaap_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant