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Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail) | Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.69% | 2.27% | 3.26%
Other Benefits | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.40% | 1.90% | 2.80%
Other Benefits | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.90% | 2.50% | 3.10%

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&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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