ACQUISITIONS - Schedule of Finite-Lived Intangible Assets Acquired (Details) - Supervalu $ in Thousands	Oct. 22, 2018 USD ($)
Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Unfavorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Minimum | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	11 years
Minimum | Favorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum | Trade Names [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Minimum | Pharmacy Prescription Files [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	19 years
Maximum | Favorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	25 years
Maximum | Trade Names [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years
Maximum | Pharmacy Prescription Files [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Continuing Operations [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	$ 911,900
Continuing Operations [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	815,000
Continuing Operations [Member] | Favorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	33,099
Continuing Operations [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	66,000
Continuing Operations [Member] | Pharmacy Prescription Files [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	0
Continuing Operations [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	9,000
Continuing Operations [Member] | Unfavorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	11,199
Discontinued Operations [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	58,100
Discontinued Operations [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	0
Discontinued Operations [Member] | Favorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	0
Discontinued Operations [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	17,000
Discontinued Operations [Member] | Pharmacy Prescription Files [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	41,100
Discontinued Operations [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	0
Discontinued Operations [Member] | Unfavorable Operating Leases [Member]
Business Acquisition [Line Items]
Finite Lived Intangible Assets	$ 0