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Related Parties (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Aug. 31, 2017
Related Parties [Abstract]          
Sales to Tractor Supply $ 400,000 $ 300,000 $ 900,000 $ 800,000  
Accounts receivable from Tractor Supply $ 300,000   $ 300,000   $ 0