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Summary of Significant Accounting Policies - Revenue, Initial Application Period Cumulative Effect Transition (Details) - USD ($)
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Sep. 01, 2018
Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Retained earnings $ 650,695,000     $ 639,684,000
Revenues 564,020,000 $ 483,279,000    
Cost of goods sold 490,132,000 $ 406,251,000    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Retained earnings     $ 0  
Revenues $ 6,000,000      
Percentage of Total Revenue 1.00%      
Cost of goods sold $ 6,000,000