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Plan Asset and Target Asset Allocations (Detail) | Dec. 28, 2019 | Dec. 29, 2018
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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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- Definition 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 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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