Weighted Average Assumptions Used in the Measurement of Benefit Obligations (Detail)	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.14%	5.37%	2.69%
Other Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.70%	4.90%	2.40%
Other Benefits | Canada
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	5.10%	2.90%