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Pension and retirement plans (Benefit Payments) (Details)
$ in Thousands
Jun. 27, 2020
USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2021 $ 49,144
2022 41,897
2023 44,868
2024 46,817
2025 48,149
2026 through 2030 $ 259,412