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Financial Derivatives (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2012
USD ($)
Feb. 28, 2011
USD ($)
Feb. 29, 2012
USD ($)
Feb. 28, 2011
USD ($)
Aug. 31, 2011
USD ($)
Feb. 29, 2012
EUR (€)
Aug. 31, 2011
EUR (€)
Feb. 28, 2011
EUR (€)
Feb. 29, 2012
Euro [Member]
USD ($)
Feb. 28, 2011
Euro [Member]
USD ($)
Feb. 29, 2012
Euro [Member]
USD ($)
Feb. 28, 2011
Euro [Member]
USD ($)
Derivatives, Fair Value [Line Items]                        
Realized and unrealized gains, net of related income tax effects     $ 1,300,000 $ 500,000 $ 500,000              
Fixed rate, per annum 6.05%   6.05%                  
Foreign currency forward contracts after-tax net gains (losses) 1,344,000 [1] 2,069,000 [1] (2,787,000) [1] 2,813,000 [1]         700,000 0 1,000,000 (400,000)
Accumulated currency translation adjustments in AOCI, after-tax gains 1,800,000 1,100,000 1,800,000 1,100,000 900,000              
Outstanding foreign currency forward contracts to sell           € 17,000,000 € 10,000,000 € 5,000,000        
[1] Net of tax expense of $216 and $355 for the three months and six months ended February 29, 2012, respectively. Net of tax expense of $256 and $179 for the three months and six months ended February 28, 2011, respectively.