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Employee Benefit Plans (Tables)
 3 Months Ended
Feb. 23, 2020
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 23,
2020
 
February 24,
2019
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
Pension benefits
$
1,704

 
$
3,977

Postretirement benefits
509

 
893

Net periodic benefit cost
$
2,213

 
$
4,870