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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. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 433,163 $ 397,098    
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 17,374 15,453 $ 14,353  
Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 138,370 123,631    
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 9,459 7,769    
Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 278,004 249,677    
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6,764 6,176    
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 16,789 23,790 23,416 $ 23,333
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,151 1,508    
Cash [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,307 6,079    
Cash [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 268 319    
Cash [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,307 6,079    
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 268 319    
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 30,008 25,523    
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 2,057 1,618    
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 30,008 25,523    
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 2,057 1,618    
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 32,613 28,267    
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 2,236 1,792    
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 32,613 28,267    
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 2,236 1,792    
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 90,838 74,274    
Equity Securities, Equity Index Funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 984 770    
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 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 984 770    
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 90,838 74,274    
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 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 1,401 1,401    
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 96 89    
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 1,401 1,401    
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 96 89    
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, Commodity Funds [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 7,387 6,854    
Equity Securities, Commodity Funds [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 506 434    
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 7,387 6,854    
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 506 434    
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 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 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 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 0    
Fixed Income Funds, Corporate Debt Instruments [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 138,948 133,406    
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 9,526 8,456    
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 40,290 35,971    
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 2,762 2,280    
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 98,658 97,435    
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 6,764 6,176    
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 27,571 23,906    
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 27,571 23,906    
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 5,912 5,636    
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 406 356    
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 5,912 5,636    
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 406 356    
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 16,789 23,790    
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 1,151 1,508    
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 16,789 23,790 23,415 23,332
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 1,151 1,508 1,374 1,341
Other Types of Investments, Venture Capital 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 $ 1 $ 1
Equity Securities, U.S. Small-cap [Member] | Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,104 1,756    
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 144 111    
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 2,104 1,756    
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 144 111    
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