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Indebtedness (Details) (Lines of credit, USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Short-term loan agreement    
Outstanding balance 1.6 1.0
Fixed interest rate (as a percent) 1.80%  
Variable interest rate (as a percent) 1.80%  
Total unused amounts on facility 6.5 7.3
Minimum
   
Short-term loan agreement    
Maturity term 6 months 6 months
Fixed interest rate (as a percent)   1.30%
Maximum
   
Short-term loan agreement    
Maturity term 8 months 8 months
Fixed interest rate (as a percent)   1.70%