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RESTRUCTURING ACTIVITIES AND ASSET IMPAIRMENTS (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Oct. 27, 2018 USD ($)	Jan. 27, 2018 USD ($) store	Oct. 28, 2017 USD ($)	Jul. 28, 2018 USD ($)	Jul. 29, 2017 USD ($)
Restructuring Costs Recorded in Fiscal 2016
Business Combination, Integration Related Costs Remainder Of Fiscal Year	$ 12,000
Restructuring charges	412		$ 0
Goodwill impairment		$ 7,900
Restructuring Costs [Abstract]
Restructuring, acquisition, and integration related expenses	68,004		$ 0
Retail Divestitures And Adjustments To Cost-Structure [Member]
October 27, 2018
Restructuring Charges	36,069
Restructuring Reserve Acquired	6,193
Payments for Restructuring	0
Restructuring Reserve	42,262
Earth Origins Market [Member]
Restructuring Costs Recorded in Fiscal 2016
Restructuring charges		$ 3,400
Restructuring Costs [Abstract]
Restructuring, acquisition, and integration related expenses	16,100
Gain (Loss) on Disposition of Business	2,700
Number of Stores Closed | store		3
Number of Stores | store		12
October 27, 2018
Restructuring Charges				$ 2,200	$ 2,219
Payments for Restructuring	(2,026)
Restructuring Reserve	193
2017 Cost Saving and Efficiency Initiatives [Member]
October 27, 2018
Restructuring Charges					6,864
Payments for Restructuring	(6,599)
Restructuring Reserve	265
Restructuring Reserve, Accrual Adjustment		$ 100
Employee Severance, Change-in-Control [Member] | Retail Divestitures And Adjustments To Cost-Structure [Member]
October 27, 2018
Restructuring Charges	33,800
Employee Severance [Member] | Retail Divestitures And Adjustments To Cost-Structure [Member]
October 27, 2018
Restructuring Charges	34,966
Restructuring Reserve Acquired	6,193
Payments for Restructuring	0
Restructuring Reserve	41,159
Employee Severance [Member] | Earth Origins Market [Member]
October 27, 2018
Restructuring Charges	819
Payments for Restructuring	(626)
Restructuring Reserve	193
Employee Severance [Member] | 2017 Cost Saving and Efficiency Initiatives [Member]
October 27, 2018
Restructuring Charges					6,606
Payments for Restructuring	(6,341)
Restructuring Reserve	265
Tax Payments [Member] | Retail Divestitures And Adjustments To Cost-Structure [Member]
October 27, 2018
Restructuring Charges	1,028
Restructuring Reserve Acquired	0
Payments for Restructuring	0
Restructuring Reserve	1,028
Facility Closing [Member] | Earth Origins Market [Member]
October 27, 2018
Restructuring Charges					1,400
Payments for Restructuring	(1,400)
Restructuring Reserve	0
Facility Closing [Member] | 2017 Cost Saving and Efficiency Initiatives [Member]
October 27, 2018
Restructuring Charges					$ 258
Payments for Restructuring	(258)
Restructuring Reserve	0
Other Restructuring [Member] | Retail Divestitures And Adjustments To Cost-Structure [Member]
October 27, 2018
Restructuring Charges	75
Restructuring Reserve Acquired	0
Payments for Restructuring	0
Restructuring Reserve	75
SUPERVALU [Member] | Restructuring, Settlement and Impairment Provisions [Member]
October 27, 2018
Business Combination, Acquisition Related Costs	25,600
Business Combination, Integration Related Costs	$ 6,300

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