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Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended
Sep. 01, 2015
shares
Aug. 31, 2016
$ / shares
shares
Nov. 30, 2016
item
$ / shares
shares
Aug. 31, 2016
$ / shares
shares
Time-based restricted stock | Executive officers        
Stock Based Compensation        
Cumulative shares granted   16,312    
Time-based restricted stock | Executive officers | August 31, 2019 vesting date        
Stock Based Compensation        
Shares granted   7,768    
Time-based restricted stock | Executive officers | August 31, 2021 vesting date        
Stock Based Compensation        
Shares granted   8,544    
Stock options | Executive officers | August 31, 2019 vesting date        
Stock Based Compensation        
Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 64.37   $ 64.37
Shares authorized   23,563   23,563
RSU | Non-executive members of management | August 31, 2021 vesting date        
Stock Based Compensation        
Shares granted       8,805
2015 LTIP | Performance and service based restricted stock | Executive officers        
Stock Based Compensation        
Shares granted     6,277  
Cumulative shares granted     13,239  
2015 LTIP | Performance and service based restricted stock | Executive officers | August 31, 2017 vesting date        
Stock Based Compensation        
Shares granted 6,962      
2017 LTIP | Performance and service based restricted stock | Executive officers and other members of management | August 31, 2018 vesting date        
Stock Based Compensation        
Shares granted     5,399  
2017 LTIP | Time-based restricted stock | Executive officers and other members of management | August 31, 2018 vesting date        
Stock Based Compensation        
Shares granted     5,367  
2017 LTIP | Stock options | Executive officers and other members of management        
Stock Based Compensation        
Number Options Outstanding (in shares)     15,028  
Weighted Average Exercise Price (in dollars per share) | $ / shares     $ 64.37  
Number of equal annual allotments in which awards will vest | item     3  
Stock options expiring on August 31, 2026 (in shares)     5,596  
Stock options expiring on September 1, 2026 (in shares)     9,432