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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,926,311  
Net income $ 87,476 $ 50,208 73,529 $ 96,249
Dividends on common stock     $ (6,686)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     1,049,260  
Stock Issued During Period, Value, Stock Options Exercised     $ 17,433  
Stock Issued During Period, Value, Share-based Compensation, Gross     0  
Stock-based compensation     12,149  
Tax payments associated with stock-based payment awards     (6,787)  
Ending balance $ 2,015,949   $ 2,015,949  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (117,946,000)  
Beginning balance     $ 117,946  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     1,049,000  
Stock Issued During Period, Value, Stock Options Exercised     $ 1,049  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     54,000  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 54  
Common Stock, Shares, Outstanding (in shares) (119,049,000)   (119,049,000)  
Ending balance $ 119,049   $ 119,049  
Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     727,483  
Stock Issued During Period, Value, Stock Options Exercised     16,384  
Stock Issued During Period, Value, Share-based Compensation, Gross     (5,762)  
Stock-based compensation     12,149  
Ending balance 750,254   750,254  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,735,695  
Net income     73,529  
Dividends on common stock     (6,686)  
Ending balance 1,802,538   1,802,538  
Accumulated Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     (16,924)  
Ending balance $ (16,924)   $ (16,924)  
Grantor Stock Ownership Trust        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (8,898,000)  
Beginning balance     $ (96,509)  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     438,000  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 4,749  
Common Stock, Shares, Outstanding (in shares) (8,460,000)   (8,460,000)  
Ending balance $ (91,760)   $ (91,760)  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (22,021,000)  
Beginning balance     $ (541,380)  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     37,000  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 959  
Tax payments associated with stock-based payment awards     $ (6,787)  
Common stock repurchased (in shares)     (217,000)  
Common Stock, Shares, Outstanding (in shares) (22,201,000)   (22,201,000)  
Ending balance $ (547,208)   $ (547,208)