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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
Aug. 31, 2015
Aug. 31, 2014
Cash equivalents carried at cost $ 41.1 $ 34.4
2013 and 2011 Fixed Rate Notes [Member]    
Long-term debt, fair value 428.1  
Long-term debt, carrying value, including accrued interest 428.1  
2011 Variable Rate Notes [Member]    
Long-term debt, fair value 10.5  
Long-term debt, carrying value, including accrued interest $ 10.5