Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2019 USD ($) Age	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percent of cost for inventories determined using LIFO	85.00%	85.00%
Excess of Replacement or Current Costs over Stated LIFO Value | $	$ 528,997,000	$ 489,058,000
Lessee, Lease, Existence of Option to Extend [true false]	true
Lessee, Operating Lease, Description	Leases include five year renewal options. Renewal options are included in the right-of-use asset and lease liability to the extent it is reasonably certain the option will be exercised.
Lessee, Lease, Assumptions and Judgments, Discount Rate, Description	The incremental borrowing rate is estimated based on a composite index of debt for similarly rated companies with comparable terms.
Postretirement Benefits Number of Years of Full Time Service for Eligibility	5 years
Age Plus Years of Service Required to Qualify for Post Retirement Benefits | Age	65
Minimum Retirement Age For Eligible Employees Of Postretirement Plans | Age	55
Minimum Years of Full Time Service for Eligible Employees of Postretirement Plans	10 years
Accumulation of Losses Exceeds Benefit Obligation	10.00%
Percent Revenue from Grocery Sales	84.00%
Percent Revenue from other products and Services	16.00%
Advertising costs | $	$ 245,403,000	$ 249,123,000	$ 251,933,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Lessee, Lease, Term of Contract	20 years
Lessee Leases, Renewal Term	5 years