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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.