Employee Benefit Plans (Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets, Other Postretirement Benefit Plans) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
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
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	130
Fair value of plan assets at end of year	0	130
Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	130
Fair value of plan assets at end of year		130
Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement	130	1,074
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