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Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail) - North America | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
--- | --- | --- | ---
Pension Benefits |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 4.11% | 4.33% | 3.91%
Other Benefits, United States |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 3.60% | 3.70% | 3.40%
Other Benefits, Canada |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Discount rate | 3.80% | 4.00% | 4.00%

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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