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Stockholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,723,145  
Net income $ 31,782 $ 15,597 46,041 $ 28,724
Dividends on common stock     $ (4,341)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     255,623  
Stock Issued During Period, Value, Stock Options Exercised     $ 3,049  
Stock Issued During Period, Value, Share-based Compensation, Gross     0  
Stock-based compensation     7,037  
Stock repurchases     (2,543)  
Ending balance $ 1,772,388   $ 1,772,388  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (116,224,000)  
Beginning balance     $ 116,224  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     256,000  
Stock Issued During Period, Value, Stock Options Exercised     $ 256  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     66,000  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 66  
Common Stock, Shares, Outstanding (in shares) (116,546,000)   (116,546,000)  
Ending balance $ 116,546   $ 116,546  
Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     696,938  
Stock Issued During Period, Value, Stock Options Exercised     2,793  
Stock Issued During Period, Value, Share-based Compensation, Gross     (3,764)  
Stock-based compensation     7,037  
Ending balance 703,004   703,004  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,563,742  
Net income     46,041  
Dividends on common stock     (4,341)  
Ending balance 1,605,442   1,605,442  
Accumulated Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     (16,057)  
Ending balance $ (16,057)   $ (16,057)  
Grantor Stock Ownership Trust        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (9,432,000)  
Beginning balance     $ (102,300)  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     278,500  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 3,021  
Common Stock, Shares, Outstanding (in shares) (9,153,000)   (9,153,000)  
Ending balance $ (99,279)   $ (99,279)  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Shares, Outstanding (in shares)     (21,720,000)  
Beginning balance     $ (535,402)  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     27,000  
Stock Issued During Period, Value, Share-based Compensation, Gross     $ 677  
Stock repurchases     $ (2,543)  
Treasury Stock, Shares, Acquired (in shares)     (152,000)  
Common Stock, Shares, Outstanding (in shares) (21,845,000)   (21,845,000)  
Ending balance $ (537,268)   $ (537,268)