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Financial Derivatives (Narrative) (Details)
 3 Months Ended 12 Months Ended 3 Months Ended
Nov. 30, 2011
USD ($)
Nov. 30, 2010
USD ($)
Aug. 31, 2011
USD ($)
Nov. 30, 2011
EUR (€)
Aug. 31, 2011
EUR (€)
Nov. 30, 2011
Euro Member Countries, Euro
USD ($)
Nov. 30, 2010
Euro Member Countries, Euro
USD ($)
Realized and unrealized gains, net of related income tax effects $ 1,100,000 $ 600,000 $ 500,000        
Foreign currency forward contracts (losses) (4,131,000) [1] 744,000 [1]       300,000 (400,000)
Accumulated currency translation adjustments in Other Comprehensive Income, after tax gains 1,200,000 1,100,000 900,000        
Notional Amount of Foreign Currency Derivative Sale Contracts       € 17,000,000 € 10,000,000    
Fixed rate, per annum 6.05%            
[1] Net of tax expense (benefit) of $139 and ($77) for the three months ended November 30, 2011 and 2010, respectively.