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Fair Values (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2013
Jul. 31, 2012
Debt Instrument [Line Items]    
Aggregate carrying amount of equity method investments $ 18.5 $ 20.1
Long-term Debt [Member]
   
Debt Instrument [Line Items]    
Fair value of debt 132.4  
Debt carrying amount 116.9  
Short-term Debt [Member]
   
Debt Instrument [Line Items]    
Fair value of debt 82.2  
Debt carrying amount $ 80.0