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Associate Retirement Plans - Estimated Benefit Payments Expected to be Paid (Detail) - Post-retirement Medical Benefits [Member]
$ in Thousands
Dec. 28, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 466
2021 503
2022 539
2023 571
2024 597
2025 to 2029 $ 3,281