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Related Parties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Related Parties [Abstract]        
Sales to Tractor Supply $ 0.2 $ 0.2 $ 0.4 $ 0.4
Accounts receivable from Tractor Supply $ 0.1   $ 0.1