Retirement and Post Retirement Health Care Plans (Schedule Of Defined Benefit Pension Assets Investment) (Details)	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	100.00%
Target Return	7.00%
Equity investments, Actual Allocation	100.00%	100.00%
Equity Investments
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	73.00%
Equity investments, Actual Allocation	68.00%	71.00%
Equity Investments \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Return minimum	0.065
Equity Investments \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Return minimum	0.083
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	22.00%
Fixed income, Target Return minimum	3.70%
Fixed income, Target Return maximum	6.10%
Equity investments, Actual Allocation	27.00%	24.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	5.00%
Target Return	5.40%
Equity investments, Actual Allocation	5.00%	5.00%

Defined benefit pension assets target return.

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Defined benefit plan target allocation percentage of fixed investment income securities range maximum.

+ References

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Defined benefit plan target allocation percentage of fixed investment income securities range minimum.

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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.

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Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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