LONG-TERM DEBT - ABL Credit Facility, Narrative (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Aug. 14, 2020	Aug. 01, 2020	Oct. 19, 2018	Aug. 29, 2018
Debt Instrument [Line Items]
Notes payable	$ 2,620,587,000		$ 2,426,994,000
Debt issuance costs, net	$ 42,122,000		$ 45,846,000
Line of credit | Letter of credit | ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, fronting fee percentage	0.125%
Debt instrument, covenant, fixed charge coverage ratio, minimum	1.0
Line of credit facility, maximum aggregate availability of the aggregate borrowing base	$ 235,000,000.0
Line of credit facility, maximum percentage of aggregate availability of the aggregate borrowing base	10.00%
Line of credit | Letter of credit | ABL Credit Facility | UNITED STATES
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 300,000,000		$ 300,000,000.0
Line of credit | Letter of credit | ABL Credit Facility | CANADA
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 25,000,000		25,000,000.0
Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Remaining availability under ABL credit facility	$ 1,008,288,000
Unused facility fees (as a percent)	0.25%
Line of credit | Revolving credit facility | ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				2,100,000,000.0
Line of credit facility, maximum borrowing capacity, optional increase				600,000,000.0
Line of credit facility, maximum borrowing capacity, including optional increase				$ 2,700,000,000.0
Remaining availability under ABL credit facility	$ 1,008,300,000
Unused facility fees (as a percent)	0.25%
Line of credit | Revolving credit facility | ABL Credit Facility | Outstanding borrowings less than 25 percent of aggregate commitments
Debt Instrument [Line Items]
Unused facility fees (as a percent)	0.375%
Percentage of average daily total outstanding to aggregate commitments	25.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Outstanding borrowings equal or greater than 25 percent of aggregate commitments
Debt Instrument [Line Items]
Unused facility fees (as a percent)	0.25%
Percentage of average daily total outstanding to aggregate commitments	25.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Accounts receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Credit card receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Inventories
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Pharmacy receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | UNITED STATES
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,050,000,000.0			$ 2,050,000,000.0
Line of credit facility, borrowing capacity, reserves	231,900,000
Line of credit facility, current borrowing capacity	2,185,800,000
Notes payable	986,700,000
Debt issuance costs, net	10,600,000
Letters of credit outstanding, amount	$ 97,200,000
Line of credit | Revolving credit facility | ABL Credit Facility | UNITED STATES | Base rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	0.25%
Line of credit | Revolving credit facility | ABL Credit Facility | UNITED STATES | London interbank offered rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	1.25%
Line of credit | Revolving credit facility | ABL Credit Facility | CANADA
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50,000,000.0			50,000,000.0
Line of credit facility, borrowing capacity, reserves	4,100,000
Line of credit facility, current borrowing capacity	42,200,000
Remaining availability under ABL credit facility	2,092,200,000
Letters of credit outstanding, amount	$ 0
Line of credit | Revolving credit facility | ABL Credit Facility | CANADA | Prime rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	0.25%
Line of credit | Revolving credit facility | ABL Credit Facility | CANADA | Bankers acceptance equivalent rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	1.25%
Line of credit | Revolving credit facility | Former ABL credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 900,000,000.0
Line of credit | Bridge loan | ABL Credit Facility | UNITED STATES
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				100,000,000.0
Line of credit | Bridge loan | ABL Credit Facility | CANADA
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 3,500,000