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Related Parties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Related Parties [Abstract]        
Sales to tractor supply $ 0.3 $ 0.2 $ 0.6 $ 0.4
Accounts receivable from tractor supply $ 0.1   $ 0.1