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Financial Derivatives (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2012 USD ($) | May 31, 2011 USD ($) | May 31, 2012 USD ($) | May 31, 2011 USD ($) | Aug. 31, 2011 USD ($) | May 31, 2012 Euro [Member] USD ($) | May 31, 2011 Euro [Member] USD ($) | May 31, 2012 Euro [Member] USD ($) | May 31, 2011 Euro [Member] USD ($) | May 31, 2012 Euro [Member] EUR (€) | Aug. 31, 2011 Euro [Member] EUR (€) | May 31, 2011 Euro [Member] EUR (€)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gains, net of related income tax effects | $ 2,700,000 |  | $ 400,000 |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |
Fixed rate, per annum | 6.05% |  |  |  | 6.05% |  |  |  |  |  |  |  |  |  |  |
Total contract value of outstanding derivative forward contracts not designated as a hedging instrument | 2,300,000 |  | 1,100,000 |  | 2,300,000 |  | 1,100,000 |  | 700,000 |  |  |  |  |  |  |
Foreign currency forward contracts after-tax net gains (losses) | (4,599,000) | [1] | 1,853,000 | [1] | (7,386,000) | [1] | 4,666,000 | [1] |  | 200,000 | 300,000 | 800,000 | 700,000 |  |  |
Accumulated currency translation adjustments in AOCI, after-tax gains | 2,700,000 |  | 800,000 |  | 2,700,000 |  | 800,000 |  | 900,000 |  |  |  |  |  |  |
Outstanding foreign currency forward contracts to sell |  |  |  |  |  |  |  |  |  |  |  |  |  | € 22,500,000 | € 10,000,000 | € 10,000,000
[1] | Net of tax expense of $530 and $885 for the three months and nine months ended May 31, 2012, respectively. Net of tax expense of $215 and $394 for the three months and nine months ended May 31, 2011, respectively.

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- Definition The effective portion of gain or loss included in accumulated other comprehensive income on derivative instruments designated and qualifying as hedging instruments. + References No definition available. + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 18, 19, 22, 23, 24, 25, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 31 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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