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Stockholders' Equity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Mar. 25, 2014
Jan. 29, 2013
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
May 31, 2014
Common Stock
May 31, 2013
Common Stock
May 31, 2014
Paid-in Capital
May 31, 2013
Paid-in Capital
May 31, 2014
Retained Earnings
May 31, 2013
Retained Earnings
May 31, 2014
Accumulated Other Comprehensive Income
Nov. 30, 2013
Accumulated Other Comprehensive Income
May 31, 2013
Accumulated Other Comprehensive Income
Nov. 30, 2012
Accumulated Other Comprehensive Income
May 31, 2013
Trust for Benefit of Employees [Member]
May 31, 2014
Trust for Benefit of Employees [Member]
Nov. 30, 2013
Trust for Benefit of Employees [Member]
May 31, 2014
Treasury Stock
May 31, 2013
Treasury Stock
Equity [Abstract]                                          
Treasury Stock Acquired, Average Cost Per Share $ 18.00 $ 18.25                                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Beginning balance         $ 536,086 $ 376,806 $ 115,296 $ 115,178 $ 788,893 $ 888,579 $ 481,889 $ 450,292 $ (17,516) $ (17,516) $ (27,958) $ (27,958) $ (115,149) $ (113,911) $ (113,911) $ (718,565) $ (934,136)
Net income (loss)     26,624 (2,973) 37,187 (15,431)         37,187 (15,431)                  
Dividends on common stock         (4,388) (4,179)         (4,388) (4,179)                  
Stock Issued During Period, Value, Stock Options Exercised         64 1,517 10 113 54 1,404                      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures         0 0 54   (54) (325)             325        
Stock-based compensation         3,725 2,044     3,725 2,044                      
Stock Issued During Period, Value, Treasury Stock Reissued         137,045 109,503     (135,590) (106,622)                   272,635 216,125
Grantor stock ownership trust           589       305             284        
Ending balance     709,673 470,816 709,673 470,816 115,360 115,291 657,028 785,385 514,688 430,682 (17,516) (17,516) (27,958) (27,958) (114,540) (113,911) (113,911) (445,976) (718,044)
Treasury Stock, Value, Acquired, Cost Method         $ (46) $ (33)                           $ (46) $ (33)