GOODWILL AND INTANGIBLE ASSETS - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Aug. 01, 2020
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 1,144,888	$ 1,144,811
Intangible assets, accumulated amortization	254,120	231,024
Finite-lived intangible assets, net	890,768	913,787
Indefinite-lived intangible assets, gross carrying amount	1,200,701	1,200,624
Indefinite-lived intangible assets, accumulated amortization	254,120	231,024
Indefinite-lived intangible assets, net carrying value	946,581	969,600
Trademarks and tradenames
Schedule of Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	55,813	55,813
Indefinite-lived intangible assets, accumulated amortization	0	0
Indefinite-lived intangible assets, net	55,813	55,813
Customer relationships
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1,007,195	1,007,118
Intangible assets, accumulated amortization	188,006	172,832
Finite-lived intangible assets, net	819,189	834,286
Pharmacy prescription files
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	32,900	32,900
Intangible assets, accumulated amortization	9,422	7,964
Finite-lived intangible assets, net	23,478	24,936
Non-compete agreements
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	12,900	12,900
Intangible assets, accumulated amortization	12,786	11,500
Finite-lived intangible assets, net	114	1,400
Operating lease intangibles
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	8,193	8,193
Intangible assets, accumulated amortization	4,420	4,020
Finite-lived intangible assets, net	3,773	4,173
Trademarks and tradenames
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	83,700	83,700
Intangible assets, accumulated amortization	39,486	34,708
Finite-lived intangible assets, net	$ 44,214	$ 48,992