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Related Parties (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Aug. 31, 2018
Related Parties [Abstract]          
Sales to Tractor Supply $ 0.3 $ 0.2 $ 0.7 $ 0.5  
Accounts receivable from Tractor Supply $ 0.3   $ 0.3   $ 0.5