Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail)	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.37%	2.69%	2.27%
Other Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	2.40%	1.90%
Other Benefits | Canada
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%	2.90%	2.50%