Employee Benefit Plans (Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets, Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 19,216	$ 16,279
Realized gains (losses)	1,647	1,776	$ (1,621)
Fair value of plan assets at end of year	21,972	19,216	16,279
Other Postretirement Benefits Plan [Member] | Multi-strategy hedge funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	130
Fair value of plan assets at end of year		130
Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	434,310
Fair value of plan assets at end of year	473,430	434,310
Pension Plans, Defined Benefit | Multi-strategy hedge funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,721
Fair value of plan assets at end of year		1,721
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	130
Fair value of plan assets at end of year	0	130
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member] | Multi-strategy hedge funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	130	1,176	1,151
Realized gains (losses)		315
Unrealized gains (losses)		(287)	25
Fair value of plan assets at end of year	0	130	1,176
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale	(1,721)	(15,586)
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase			22,196
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	24,409	39,130	16,789
Realized gains (losses)		4,175
Unrealized gains (losses)	571	(3,310)	145
Fair value of plan assets at end of year	23,259	24,409	39,130
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit | Foreign Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale	0	0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase			22,196
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	22,688	22,196	0
Realized gains (losses)		0
Unrealized gains (losses)	571	492	0
Fair value of plan assets at end of year	23,259	22,688	22,196
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit | Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale	(1,721)	(15,586)
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase			0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,721	16,934	16,789
Realized gains (losses)		4,175
Unrealized gains (losses)	0	(3,802)	145
Fair value of plan assets at end of year	$ 0	$ 1,721	$ 16,934