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FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($) $ in Millions | Oct. 30, 2021 | Jul. 31, 2021
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Level 1 | Other long-term assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Mutual funds | $ 1 | $ 2
Level 1 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap assets | 0 | 0
Level 1 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 0 | 0
Level 1 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 0 | 0
Level 1 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 0 | 0
Level 2 | Other long-term assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Mutual funds | 0 | 0
Level 2 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap assets | 1 | 1
Level 2 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 1 | 1
Level 2 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 28 | 33
Level 2 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 28 | 42
Level 3 | Other long-term assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Mutual funds | 0 | 0
Level 3 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap assets | 0 | 0
Level 3 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 0 | 0
Level 3 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | 0 | 0
Level 3 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Swap liabilities | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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