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Employee Benefit Plans (Schedule of Changes in Fair Value of Plan Assets, Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Thousands
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 434,310 $ 393,505    
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 19,216 16,279 $ 17,374  
Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 161,289 135,052    
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 12,123 9,332    
Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 248,612 219,323    
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6,963 5,771    
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 24,409 39,130 16,789 $ 23,790
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 130 1,176    
Cash [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6,177 6,326    
Cash [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 408 390    
Cash [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6,177 6,326    
Cash [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 408 390    
Cash [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Cash [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Cash [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Cash [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Large-cap [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 57,797 35,072    
Equity Securities, U.S. Large-cap [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,365 2,436    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 57,797 35,072    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,365 2,436    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Large-cap [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, International large-cap value[Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 26,914 24,175    
Equity Securities, International large-cap value[Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,033 1,679    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 26,914 24,175    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,033 1,679    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, International large-cap value[Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Equity Index Funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   54,342    
Equity Securities, Equity Index Funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 971 833    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 971 833    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   54,342    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Equity Securities, Equity Index Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Domestic Real Estate Funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,010 1,353    
Equity Securities, Domestic Real Estate Funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 152 94    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,010 1,353    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 152 94    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Domestic Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Foreign Real Estate Funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 22,688 22,196    
Equity Securities, Foreign Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Foreign Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, Foreign Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 22,688 22,196    
Equity Securities, Commodity Funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   886    
Equity Securities, Commodity Funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   62    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   886    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   62    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Equity Securities, Commodity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0    
Fixed Income Funds, Corporate Debt Instruments [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 139,300 131,211    
Fixed Income Funds, Corporate Debt Instruments [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 10,520 9,115    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 47,104 48,133    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3,557 3,344    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 92,196 83,078    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6,963 5,771    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, Corporate Bonds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 29,846 24,848    
Fixed Income Funds, Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 29,846 24,848    
Fixed Income Funds, Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, High Yield Bonds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 5,734 5,186    
Fixed Income Funds, High Yield Bonds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 433 360    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 5,734 5,186    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 433 360    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income Funds, High Yield Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Other Types of Investments, Multi-strategy hedge funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,721 16,934    
Other Types of Investments, Multi-strategy hedge funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 130 1,176    
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,721 16,934 16,789 23,790
Other Types of Investments, Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 130 1,176 $ 1,151 $ 1,508
Equity Securities, U.S. Small-cap [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,700 1,928    
Equity Securities, U.S. Small-cap [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 204 134    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,700 1,928    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 204 134    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity Securities, U.S. Small-cap [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 0 $ 0