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Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Related Parties [Abstract]        
Sales to Tractor Supply $ 0.3 $ 0.2 $ 0.7 $ 0.6