Revenue - Summary of Information about Disaggregated Revenue of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 02, 2021	Oct. 03, 2020	Jul. 11, 2020	Dec. 28, 2019	Oct. 05, 2019	Jul. 13, 2019	Apr. 18, 2020	Apr. 20, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 2,247,112	$ 2,060,816	$ 2,184,101	$ 1,997,953	$ 1,999,808	$ 1,995,929	$ 2,856,456	$ 2,542,375	$ 9,348,485	$ 8,536,065	$ 8,064,552
Center store [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									3,659,500	3,165,738	3,049,544
Fresh [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									3,175,103	2,982,145	2,768,826
Non-food [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,296,282	2,152,056	2,021,909
Other Products [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									111,387	87,347	85,656
Fuel [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									106,213	148,779	138,617
Individuals Customer [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,636,993	2,380,524	1,905,328
Manufacturers, brokers and distributors [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,065,075	2,245,791	2,286,893
Retailers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									4,559,911	3,838,847	3,804,151
Other Customers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									86,506	70,903	68,180
Food Distribution [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									4,577,178	3,982,609	3,991,450
Food Distribution [Member] \| Center store [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,519,279	1,209,436	1,249,374
Food Distribution [Member] \| Fresh [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,550,813	1,445,902	1,478,142
Food Distribution [Member] \| Non-food [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,407,122	1,247,964	1,185,390
Food Distribution [Member] \| Other Products [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									99,964	79,307	78,544
Food Distribution [Member] \| Manufacturers, brokers and distributors [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									75,827	179,872	197,128
Food Distribution [Member] \| Retailers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									4,425,665	3,739,316	3,733,254
Food Distribution [Member] \| Other Customers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									75,686	63,421	61,068
Retail [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,637,917	2,381,349	1,906,259
Retail [Member] \| Center store [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,097,013	928,641	747,708
Retail [Member] \| Fresh [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,013,657	900,096	688,661
Retail [Member] \| Non-food [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									419,507	402,450	330,342
Retail [Member] \| Other Products [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,527	1,383	931
Retail [Member] \| Fuel [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									106,213	148,779	138,617
Retail [Member] \| Individuals Customer [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,636,993	2,380,524	1,905,328
Retail [Member] \| Other Customers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									924	825	931
Military [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									2,133,390	2,172,107	2,166,843
Military [Member] \| Center store [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,043,208	1,027,661	1,052,462
Military [Member] \| Fresh [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									610,633	636,147	602,023
Military [Member] \| Non-food [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									469,653	501,642	506,177
Military [Member] \| Other Products [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									9,896	6,657	6,181
Military [Member] \| Manufacturers, brokers and distributors [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									1,989,248	2,065,919	2,089,765
Military [Member] \| Retailers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									134,246	99,531	70,897
Military [Member] \| Other Customers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									$ 9,896	$ 6,657	$ 6,181