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Accumulated Other Comprehensive Loss (Changes in the balances of each component of accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance $ (17,319)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 1,635 $ 2,404 $ 1,913
Income tax expense related to items of other comprehensive income (841) (2,460) (1,604)
Other comprehensive income (loss), net of tax 1,262 3,689 (3,492)
Ending Balance (16,057) (17,319)  
Accumulated Define Benefit Plans Adjustment Member      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance (17,319) (21,008)  
Net actuarial gain (loss) arising during the period 468 3,745  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1,635 2,404  
Income tax expense related to items of other comprehensive income (841) (2,460)  
Other comprehensive income (loss), net of tax 1,262 3,689  
Ending Balance $ (16,057) $ (17,319) $ (21,008)
[1] The accumulated other comprehensive loss components are included in the computation of net periodic benefit costs as further discussed in Note 20 – Postretirement Benefits.