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Severance (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Restructuring and Related Activities [Abstract]      
Severance costs $ 6.1 $ 25.6 $ 8.2
Termination benefits liability $ 2.8 $ 2.7