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Stock-Based Compensation (Narrative) (Details) - metric
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
May 31, 2019
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 2      
Percentage of shares based on market condition of total shareholder return 50.00% 50.00%      
Percentage of shares based on cumulative performance condition 50.00% 50.00%      
Cumulative performance condition 3 years 3 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    
Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation award service period (in years)     4 years