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Pension and Other Postretirement Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2014
Jun. 01, 2013
May 31, 2014
Jun. 01, 2013
Amortization of unrecognized:        
Cash contributions $ 78   $ 159  
Pension Benefits [Member]
       
Components of net periodic benefit cost (income):        
Service cost 498 621 996 1,243
Interest cost 1,933 1,726 3,864 3,456
Expected return on plan assets (2,834) (2,693) (5,665) (5,392)
Amortization of unrecognized:        
Prior service cost (3) (2) (6) (5)
Net actuarial loss 721 1,515 1,442 3,031
Net periodic benefit cost 315 1,167 631 2,333
Cash contributions 62 1,565 127 16,507
Postretirement Healthcare Benefit Plan [Member]
       
Components of net periodic benefit cost (income):        
Interest cost 2 2 4 4
Amortization of unrecognized:        
Prior service cost (31) (31) (62) (62)
Net actuarial loss (37) (37) (74) (74)
Net periodic benefit cost (66) (66) (132) (132)
Cash contributions $ 16 $ 18 $ 32 $ 36