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Plan Asset and Target Asset Allocations (Detail) | Dec. 29, 2018 | Dec. 30, 2017
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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] |  |  |
Target Allocation 2019 |  | 0.00% |
Percentage of Plan Assets at the Measurement Date |  | 2.50% | 38.60%
Plan No. 1 | Fixed Income Securities |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  | 73.70% | 27.10%
Plan No. 1 | Fixed Income Securities | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 90.00% |
Plan No. 1 | Fixed Income Securities | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 100.00% |
Plan No. 1 | Other Diversifying Strategies |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 | [1] | 0.00% |
Percentage of Plan Assets at the Measurement Date | [1] | 15.00% | 28.80%
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% | 5.50%
Plan No. 1 | Short Term Investments And Cash | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 0.00% |
Plan No. 1 | Short Term Investments And Cash | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 10.00% |
Plan No. 2 | Equity Securities | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 0.00% |
Plan No. 2 | Equity Securities | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 80.00% |
Plan No. 2 | Fixed Income Securities | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 20.00% |
Plan No. 2 | Fixed Income Securities | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 100.00% |
Plan No. 2 | Short Term Investments And Cash | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 0.00% |
Plan No. 2 | Short Term Investments And Cash | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2019 |  | 10.00% |
[1] | Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.

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