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Benefit Plans - Contributions and Benefit Payments (Details)
$ in Thousands
Dec. 29, 2018
USD ($)
Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Company's expected contribution to benefit plans in next fiscal year $ 100
2019 10,416
2020 10,342
2021 10,283
2022 10,241
2023 10,196
2024-2028 49,820
Total 101,298
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Company's expected contribution to benefit plans in next fiscal year 1,100
2019 1,102
2020 1,244
2021 1,061
2022 1,112
2023 1,226
2024-2028 5,821
Total $ 11,566