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Employee Benefit Plans (Tables)
 9 Months Ended
Aug. 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 EndedNine Months Ended
 August 23,
2020		August 25,
2019		August 23,
2020		August 25,
2019
 (Dollars in thousands)
Net periodic benefit cost:
Pension benefits$1,830 $3,975 $5,186 $11,968 
Postretirement benefits509 893 1,528 2,679 
Net periodic benefit cost$2,339 $4,868 $6,714 $14,647