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FAIR VALUE MEASUREMENTS - Non-recurring Basis (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Jul. 31, 2019
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Convertible Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unamortized discount | $ (87,897) | $ (109,956)
Unamortized debt issuance cost | (4,903) | (6,134)
Reported Value Measurement | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes, net | 482,200 | 458,910
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes, net | $ 495,938 | $ 527,275

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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