Employee Benefit Plans (Schedule of Changes in Fair Value of Plan Assets, Pension Plans) (Details) - Pension Plans, Defined Benefit - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 433,163	$ 397,098
Equity Securities, U.S. Small-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,104	1,756
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,307	6,079
Equity Securities, U.S. Large-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,008	25,523
Equity Securities, International large-cap value[Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,613	28,267
Equity Securities, Emerging Markets Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,348	12,144
Equity Securities, Equity Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90,838	74,274
Equity Securities, Domestic Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,401	1,401
Equity Securities, Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,387	6,854
Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24,946	22,059
Fixed Income Funds, Corporate Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	138,948	133,406
Fixed Income Funds, Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27,571	23,906
Fixed Income Funds, High Yield Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,912	5,636
Other Types of Investments, Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,789	23,790
Other Types of Investments, Non U.S. Government Index Linked Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,991	32,003
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	138,370	123,631
Fair Value, Inputs, Level 1 [Member] | Equity Securities, U.S. Small-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,104	1,756
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,307	6,079
Fair Value, Inputs, Level 1 [Member] | Equity Securities, U.S. Large-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,008	25,523
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International large-cap value[Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,613	28,267
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Emerging Markets Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,348	12,144
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Equity Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,401	1,401
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,387	6,854
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds, Corporate Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40,290	35,971
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds, Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds, High Yield Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,912	5,636
Fair Value, Inputs, Level 1 [Member] | Other Types of Investments, Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Other Types of Investments, Non U.S. Government Index Linked Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	278,004	249,677
Fair Value, Inputs, Level 2 [Member] | Equity Securities, U.S. Small-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, U.S. Large-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International large-cap value[Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Emerging Markets Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Equity Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90,838	74,274
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24,946	22,059
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds, Corporate Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,658	97,435
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds, Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27,571	23,906
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds, High Yield Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Other Types of Investments, Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Other Types of Investments, Non U.S. Government Index Linked Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,991	32,003
Fair Value, Inputs, Level 3 [Member]
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] | Equity Securities, U.S. Small-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, U.S. Large-cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International large-cap value[Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Emerging Markets Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Equity Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds, Corporate Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds, Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds, High Yield Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] | Other Types of Investments, Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,789	23,790	23,415	23,332
Fair Value, Inputs, Level 3 [Member] | Other Types of Investments, Venture Capital Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	$ 1	$ 1
Fair Value, Inputs, Level 3 [Member] | Other Types of Investments, Non U.S. Government Index Linked Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0