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Compensation Plans (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
May 31, 2019
May 31, 2019
Jun. 30, 2018
May 31, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation   $ 13,100 $ 12,800 $ 24,886 $ 25,198
Tax benefit for issuance of share-based awards   3,400 $ 3,100 6,300 $ 6,000
Total unrecognized compensation cost related to nonvested share-based awards $ 99,400 $ 99,400   $ 99,400  
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition 3 years        
Potential maximum increase to common shares outstanding from restricted stock and other shares (in shares) 21,484 21,484   21,484  
Restricted cash awards, cost expected to be recognized $ 550,900 $ 550,900   $ 550,900  
Restricted cash awards, cost expected to be recognized, period 3 years        
Sign-on and Retention Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       4 years  
Amortization period       4 years  
Other Shares Issuable          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Other shares issuable (in shares) 909 909   909  
Future Service Required | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares, nonvested (in shares) 1,883 1,883   1,883  
Future Service Required | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares, nonvested (in shares) 6,010 6,010   6,010  
No Future Service Required | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares, vested (in shares) 14,565 14,565   14,565