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Goodwill and Other Intangible Assets, net Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Intangible Assets [Line Items]      
Gross Carrying Amount, Indefinite-Lived $ 1,081 $ 1,081  
Total Gross Carrying Amount 7,834 8,337  
Accumulated Amortization (3,476) (3,913)  
Intangibles, net 4,358 4,424  
Amortization of Intangible Assets 1,000 1,000 $ 1,000
Estimated amortization expense:      
2019 443    
2020 350    
2021 350    
2022 350    
2023 293    
Thereafter 1,491    
Total 3,277    
Covenants not to compete      
Intangible Assets [Line Items]      
Gross Carrying Amount 5,591 6,094  
Accumulated Amortization (2,596) (3,140)  
Intangibles, net 2,995 2,954  
Other intangible assets subject to amortization      
Intangible Assets [Line Items]      
Gross Carrying Amount 1,162 1,162  
Accumulated Amortization (880) (773)  
Intangibles, net $ 282 $ 389