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Retirement Plans and Postretirement Costs - Expected Future Benefit Payments (Details)
$ in Thousands
Jun. 28, 2020
USD ($)
SERP  
Expected future benefit payments  
2021 $ 1,040
2022 402
2023 14
2024 14
2025 14
2026-2030 928
Postretirement Benefits  
Expected future benefit payments  
2021 119
2022 116
2023 103
2024 93
2025 64
2026-2030 $ 218