Reporting Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2019 Segment Distribution_Centers Supermarkets PharmacyServices Fuel_Center	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Number of Reportable Segment | Segment	3
Number of distribution centers	11
Number of military distribution centers	7
Number of corporate-owned retail stores | Supermarkets	156
Number of retail stores offered pharmacy services | PharmacyServices	97
Number of fuel centers operated | Fuel_Center	37
Food Distribution [Member]
Segment Reporting Information [Line Items]
Number of military distribution centers	2
Concentration of Credit Risk [Member] | Net Sales [Member] | Food Distribution [Member] | Dollar General [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated net sales	17.00%	16.00%	14.00%
Concentration of Credit Risk [Member] | Net Sales [Member] | Food Distribution [Member] | Other Customers [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated net sales	4.00%	4.00%	4.00%