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Employee Benefit Plans (Tables)
 9 Months Ended
Aug. 26, 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
 
Nine Months Ended
 
August 26,
2018
 
August 27,
2017
 
August 26,
2018
 
August 27,
2017
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Pension Benefits
$
819

 
$
2,990

 
$
2,434

 
$
8,952

Postretirement Benefits
925

 
1,148

 
2,777

 
3,443

Net periodic benefit cost
$
1,744

 
$
4,138

 
$
5,211

 
$
12,395


The Company increased the estimated contributions to its pension plans in 2018 from $94.7 million to $124.0 million.