REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 03, 2019	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 6,407,086	$ 5,962,620	$ 6,149,206	$ 2,868,156	$ 2,592,248	$ 2,648,879	$ 2,528,011	$ 2,457,545	$ 21,387,068	$ 10,226,683	$ 9,274,471
Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									21,324,693	10,169,840	9,210,815
Operating Segments | Other Segments
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									228,518	228,465	232,192
Consolidation, Eliminations
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									(166,143)	(171,622)	(168,536)
Supernatural
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									4,393,000	3,758,000	3,096,000
Supernatural | Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									4,393,000	3,758,000	3,096,000
Supernatural | Operating Segments | Other Segments
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
Supernatural | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
Independents
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									3,179,000	2,668,000	2,490,000
Independents | Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									3,179,000	2,668,000	2,490,000
Adjustment to revenue from contract with customer, excluding assessed tax										95,000	63,000
Independents | Operating Segments | Other Segments
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
Independents | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
Supermarkets
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									12,505,000	2,820,000	2,731,000
Supermarkets | Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									12,505,000	2,820,000	2,731,000
Adjustment to revenue from contract with customer, excluding assessed tax										36,000	16,000
Supermarkets | Operating Segments | Other Segments
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
Supermarkets | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									0	0	0
SUPERVALU
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									1,310,000	981,000	957,000
SUPERVALU | Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									1,248,000	925,000	894,000
Other Customer Type
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									21,387,000	10,227,000	9,274,000
Other Customer Type | Operating Segments | Wholesale Segment
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									21,325,000	10,171,000	9,211,000
Adjustment to revenue from contract with customer, excluding assessed tax										58,000	47,000
Other Customer Type | Operating Segments | Other Segments
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									228,000	228,000	232,000
Other Customer Type | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenue from contract with customer, excluding assessed tax									$ (166,000)	$ (172,000)	$ (169,000)