Annual report pursuant to Section 13 and 15(d)

Derivatives (Details)

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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Derivative [Line Items]    
Notional amount of foreign currency cash flow hedge derivatives $ 9.7 $ 3.0
Unrealized losses expected to be reclassified during next 12 months 0.1  
Notional amount of foreign currency fair value hedge derivatives 383.6 197.5
Net foreign currency gains (losses) $ 0.8