Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Parentheticals) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain (loss) on interest rate swaps, tax	$ 0	$ 0	$ 68
Reclassification of loss into earnings from interest rate swaps, tax	10	0	475
Unrecognized net actuarial gain on postretirment benefit plans, tax	0	0	4
Reclassification of net actuarial gain into earnings from postretirement benefit plans, tax	0	0	(11)
Reclassification of prior service credits into earnings from postretirement benefit plans, tax	0	0	(1)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain (loss) on interest rate swaps, tax	0	0	68
Reclassification of loss into earnings from interest rate swaps, tax	10	0	475
Amortization of unrealized loss on dedesignated interest rate swaps, tax	0	0	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrecognized net actuarial gain on postretirment benefit plans, tax	0	0	4
Reclassification of net actuarial gain into earnings from postretirement benefit plans, tax	0	0	(11)
Reclassification of prior service credits into earnings from postretirement benefit plans, tax	$ 0	$ 0	$ (1)

Other Comprehensive Income (Loss), Amortization of Unrealized Losses on Dedesignated Derivatives, Tax

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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- Definition

Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

+ References

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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- Definition

Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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