DISCONTINUED OPERATIONS - Narrative (Details) $ in Thousands	3 Months Ended					9 Months Ended
	Apr. 27, 2019 USD ($)		Jan. 26, 2019 store	Apr. 28, 2018 USD ($)		Apr. 27, 2019 USD ($)		Apr. 28, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 5,962,620			$ 2,648,879		$ 14,979,982		$ 7,634,435
Revenue from Contract with Customer, Excluding Assessed Tax	5,962,620	[1]		2,648,879	[2]	14,979,982	[3]	7,634,435	[2]
Shop 'n Save [Member] | Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores sold | store			5
Hornbacher's [Member] | Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores sold | store			7
Number of stores held for sale | store			8
Operating Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax
Consolidation, Eliminations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(43,811)			(46,303)		(120,304)		(133,000)
Consolidation, Eliminations [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	(128,300)					(291,700)
Wholesale | Operating Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,943,928	[1]		$ 2,633,024	[2]	14,931,170	[3]	$ 7,592,352	[2]
Wholesale | Operating Segments [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 233,400					$ 520,400

[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.