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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 |

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