Employee Benefit Plans (Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets, Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
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	$ 16,279	$ 17,374
Realized gains (losses)	1,776	(1,621)	$ 741
Fair value of plan assets at end of year	19,216	16,279	17,374
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	1,176
Fair value of plan assets at end of year	130	1,176
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	393,505
Fair value of plan assets at end of year	434,310	393,505
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	16,934
Fair value of plan assets at end of year	1,721	16,934
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	1,176
Fair value of plan assets at end of year	130	1,176
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	1,176	1,151	1,508
Realized gains (losses)	315		229
Unrealized gains (losses)	(287)	25	(24)
Fair value of plan assets at end of year	130	1,176	1,151
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	(15,586)		(8,189)
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	39,130	16,789	23,790
Realized gains (losses)	4,175		1,542
Unrealized gains (losses)	(3,310)	145	(354)
Fair value of plan assets at end of year	24,409	39,130	16,789
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	22,196	0	0
Realized gains (losses)	0		0
Unrealized gains (losses)	492	0	0
Fair value of plan assets at end of year	22,688	22,196	0
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	(15,586)		(8,189)
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	16,934	16,789	23,790
Realized gains (losses)	4,175		1,542
Unrealized gains (losses)	(3,802)	145	(354)
Fair value of plan assets at end of year	$ 1,721	$ 16,934	$ 16,789

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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+ References

No definition available.

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- Definition

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount, measured using unobservable input, of decrease in plan asset of defined benefit plan from sale.

+ References

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-Publisher FASB
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- Definition

Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase.

+ References

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