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Share-Based Compensation (Narrative) (Details)
$ in Millions
12 Months Ended
Aug. 31, 2016
USD ($)
item
shares
Aug. 31, 2015
USD ($)
shares
Aug. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding stock options vested 23,164 19,178 13,793
Shares outstanding 127,286 96,376 86,623
Pre-tax total unrecognized compensation cost related to nonvested share-based compensation | $ $ 4.1    
Weighted average period to be recognized 2 years    
Restricted Stock Units Settled In Cash [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding 6,155 5,504 5,289
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Percentage vested per year 33.00%    
Fair value vested | $ $ 2.4 $ 2.3  
Common Class [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding stock options vested 7,665 27,473  
Fair value vested | $ $ 0.6 $ 1.6  
2015 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares authorized 626,968    
Number of shares available 555,034    
Stock award ratio | item 1    
Plan effective date Jan. 26, 2015    
2015 Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option expire, years 10 years    
Vesting period 4 years    
Percentage vested per year 25.00%    
Non Employee Directors [Member] | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 9 months