REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Apr. 27, 2019		Oct. 27, 2018	Apr. 28, 2018		Apr. 27, 2019	[3]	Apr. 28, 2018
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,962,620	[1]		$ 2,648,879	[2]	$ 14,979,982		$ 7,634,435	[2]
Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax
Eliminations
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(44,000)			(46,000)	[2]	(120,000)		(133,000)	[2]
Wholesale | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,943,928	[1]		2,633,024	[2]	14,931,170		7,592,352	[2]
Other | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	62,503			62,158	[2]	169,116		175,083	[2]
Supernatural
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,102,000			992,000	[2]	3,229,000		2,776,000	[2]
Supernatural | Eliminations
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Supernatural | Wholesale | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,102,000			992,000	[2]	3,229,000		2,776,000	[2]
Supernatural | Other | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Independents
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	829,000			689,000	[2]	2,331,000		1,998,000	[2]
Independents | Eliminations
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Independents | Wholesale | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	829,000			689,000	[2]	2,331,000		1,998,000	[2]
Adjustment to Revenue from Contract with Customer, Excluding Assessed Tax			$ 25,000	25,000				77,000
Independents | Other | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Supermarkets
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,675,000			706,000	[2]	8,482,000		2,118,000	[2]
Supermarkets | Eliminations
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Supermarkets | Wholesale | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,675,000			706,000	[2]	8,482,000		2,118,000	[2]
Adjustment to Revenue from Contract with Customer, Excluding Assessed Tax			198,000	12,000				32,000
Supermarkets | Other | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0	[2]	0		0	[2]
Other
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	357,000			262,000	[2]	938,000		742,000	[2]
Other | Eliminations
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(44,000)	[1]		(46,000)	[2]	(120,000)		(133,000)	[2]
Other | Wholesale | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	338,000			246,000	[2]	889,000		700,000	[2]
Adjustment to Revenue from Contract with Customer, Excluding Assessed Tax			$ 1,000	13,000				45,000
Other | Other | Operating Segments
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 63,000	[1]		$ 62,000	[2]	$ 169,000		$ 175,000	[2]

[1] For the third quarter of fiscal 2019, the Company recorded $233.4 million within Net sales in its wholesale reportable segment attributable to discontinued operations inter-company product purchases from its Retail operating segment, which it expects will continue subsequent to the sale of certain retail banners.

[2] During the second quarter of fiscal 2019, the presentation of net sales by customer channel was adjusted to reflect changes in the classification of customer types as a result of a detailed review of customer channel definitions. There was no impact to the Condensed Consolidated Statements of Income as a result of revising the classification of customer types. As a result of this adjustment, net sales to our supermarkets channel and to our other channel for the third quarter of fiscal 2018 decreased approximately $12 million and $13 million, respectively, compared to the previously reported amounts, while net sales to the independents channel for the third quarter of fiscal 2018 increased approximately $25 million compared to the previously reported amounts. In addition, net sales to our supermarkets channel and to our other channel for the 39-week period ended April 28, 2018 decreased approximately $32 million and $45 million, respectively, compared to the previously reported amounts, while net sales to the independents channel for the 39-week period ended April 28, 2018 increased approximately $77 million compared to the previously reported amounts.

[3] During the second quarter of fiscal 2019, the presentation of net sales attributable to Supervalu was incorporated into our definitions of sales by customer channel. There was no impact to the Condensed Consolidated Statements of Income as a result of revising the classification of customer types. Net sales as reported in the first quarter of fiscal 2019 by customer channel were recast, resulting in an increase in supermarket sales of $198 million, independents of $25 million, and other of $1 million with an offsetting decrease to the Supervalu customer channel.