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Postretirement Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2014
Postretirement Benefits Additional (Textual) [Abstract]      
Interest cost $ 2,285 $ 2,270 $ 2,456
Amortization of prior service cost 1,556 1,556 1,556
Service cost 1,045 1,142 1,184
Amortization of net actuarial loss 79 848 357
Total 4,965 5,816 5,553
Liabilities related to postretirement benefit plan $ 62,200 $ 60,800  
Discounted rate for benefit plan 3.60% 3.60%  
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of insurance contracts $ 70,829 $ 67,786  
2014 1,800    
2015 2,000    
2016 2,500    
2017 2,800    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 3,500    
2018 - 2022 19,700    
Supplemental Nonqualified Unfunded Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 400 (1,300) 1,800
Benefits paid 1,400 1,400 1,200
Cash surrender value of insurance contracts 44,400 45,500  
Unfunded Death Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 200 (300) $ 700
Cash surrender value of insurance contracts $ 17,000 $ 16,800