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Summary of Significant Accounting Policies - Revenue, Initial Application Period Cumulative Effect Transition (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Sep. 01, 2018
Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Retained earnings $ 658,424,000   $ 658,424,000     $ 639,684,000
Revenues 473,565,000 $ 559,443,000 1,037,585,000 $ 1,042,722,000    
Cost of goods sold 414,688,000 $ 472,462,000 904,820,000 $ 878,713,000    
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 $ 7,000,000   $ 13,000,000      
Percentage of Total Revenue 1.00%   1.00%      
Cost of goods sold $ 7,000,000   $ 13,000,000