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Related Parties (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Aug. 31, 2018
Related Parties [Abstract]      
Sales to Tractor Supply $ 0.4 $ 0.3  
Accounts receivable from Tractor Supply $ 0.5   $ 0.5