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Related Parties (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Related Parties [Abstract]      
Sales to Tractor Supply $ 1.2 $ 1.2 $ 1.1
Accounts receivable from Tractor Supply $ 0.0 $ 0.0