SIGNIFICANT ACCOUNTING POLICIES - Changes in Insurance Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Self Insurance Reserve Rollforward Abstract [Roll Forward]
Beginning balance	$ 24,703	$ 22,776	$ 20,109
Assumed liabilities from the Supervalu acquisition	55,213	0	0
Expense	42,764	14,274	13,740
Claim payments	(33,087)	(12,347)	(11,073)
Reclassifications	(755)	0	0
Ending balance	$ 88,838	$ 24,703	$ 22,776

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant