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Retirement Plans and Postretirement Costs - Expected Future Benefit Payments (Details)
$ in Thousands
Jun. 27, 2021
USD ($)
SERP  
Expected future benefit payments  
2022 $ 468
2023 446
2024 444
2025 14
2026 14
2027-2031 585
Postretirement Benefits  
Expected future benefit payments  
2022 110
2023 98
2024 95
2025 65
2026 40
2027-2031 $ 222