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Plan Asset and Target Asset Allocations (Detail)		Dec. 28, 2019	Dec. 29, 2018
Plan No. 1
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		100.00%	100.00%
Plan No. 1 | Equity Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date			2.50%
Plan No. 1 | Fixed Income Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		100.00%	73.70%
Plan No. 1 | Fixed Income Securities | Minimum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		90.00%
Plan No. 1 | Fixed Income Securities | Maximum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		100.00%
Plan No. 1 | Other Diversifying Strategies
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date	[1]		15.00%
Plan No. 1 | Short Term Investments And Cash
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date			8.80%
Plan No. 1 | Short Term Investments And Cash | Minimum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		0.00%
Plan No. 1 | Short Term Investments And Cash | Maximum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		10.00%
Plan No. 2
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		100.00%
Plan No. 2 | Equity Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		70.00%
Plan No. 2 | Equity Securities | Minimum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		0.00%
Plan No. 2 | Equity Securities | Maximum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		80.00%
Plan No. 2 | Fixed Income Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		28.00%
Plan No. 2 | Fixed Income Securities | Minimum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		20.00%
Plan No. 2 | Fixed Income Securities | Maximum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		100.00%
Plan No. 2 | Short Term Investments And Cash
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date		2.00%
Plan No. 2 | Short Term Investments And Cash | Minimum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		0.00%
Plan No. 2 | Short Term Investments And Cash | Maximum
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2020		10.00%
[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.

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Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]

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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.

+ 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=118257860&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
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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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