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Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail) | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pension Benefits |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 4.31% | 3.71% | 4.11%
Other Benefits | United States |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 3.90% | 3.30% | 3.60%
Other Benefits | Canada |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 3.90% | 3.40% | 3.80%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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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. + Details
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