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Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 01, 2015
shares
Feb. 28, 2017
USD ($)
shares
Aug. 31, 2016
$ / shares
shares
Nov. 30, 2016
shares
May 31, 2017
item
$ / shares
shares
Restricted stock | Non-employee members of BOD          
Stock Based Compensation          
Shares granted   2,407      
Grant date value | $   $ 219      
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    
Shares authorized     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