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Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail) - North America	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Pension Benefits
Weighted Average Discount Rate [Line Items]
Discount rate	4.33%	3.91%	4.84%
Other Benefits, United States
Weighted Average Discount Rate [Line Items]
Discount rate	3.70%	3.40%	4.00%
Other Benefits, Canada
Weighted Average Discount Rate [Line Items]
Discount rate	4.00%	4.00%	4.80%

X

- 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=58740216&loc=d3e1928-114920

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X

- 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.

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