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Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Financial Statements) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Sep. 01, 2018
Aug. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Inventories, net $ 88,912 $ 93,994   $ 79,233
Other current assets 8,386 9,461   7,204
Other current liabilities 41,480 48,875   46,935
Deferred income tax liabilities 1,048 1,649   1,083
Retained earnings 483,811 477,584   484,886
Statement of Earnings        
Operating revenues 111,951 124,526    
Operating income 2,040 $ 6,201    
ASC Topic 606 [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Inventories, net     $ 78,291  
Other current assets     8,855  
Other current liabilities     46,949  
Deferred income tax liabilities     1,246  
Retained earnings     $ 485,418  
ASC Topic 606 Adjustments [Member] | ASC Topic 606 [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Inventories, net 3,669     (942)
Other current assets (1,059)     1,651
Other current liabilities 5,489     14
Deferred income tax liabilities       163
Retained earnings (2,879)     $ 532
Statement of Earnings        
Operating revenues (6,168)      
Operating income (3,280)      
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Inventories, net 92,581      
Other current assets 7,327      
Other current liabilities 46,969      
Retained earnings 480,932      
Statement of Earnings        
Operating revenues 105,783      
Operating income $ (1,240)