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Employee Benefit Plans (Tables)
 3 Months Ended
Feb. 25, 2018
Retirement Benefits [Abstract]  
Schedule of defined benefit plans disclosures
The following table summarizes the total net periodic benefit cost for the Company's defined pension plans and postretirement benefit plans:
 
Three Months Ended
 
February 25,
2018
 
February 26,
2017
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
Pension Benefits
$
849

 
$
2,892

Postretirement Benefits
926

 
1,148

Net periodic benefit cost
$
1,775

 
$
4,040