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Stock-Based Compensation (Narrative) (Details) - metric
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2018
Aug. 31, 2018
Nov. 30, 2017
Nov. 30, 2016
Long-Term Incentive Plan (LTIP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award market condition period   3 years 3 years 3 years
Stock-based compensation award service period (in years) 3 years 3 years 3 years 3 years
Number of performance metrics 2      
Percentage of shares based on market condition of total shareholder return 50.00%      
Percentage of shares based on cumulative performance condition 50.00%      
Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation award service period (in years)   4 years    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation award service period (in years)   3 years