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CONVERTIBLE SENIOR NOTES - Components of Notes (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019	Jan. 31, 2018
Debt Instrument [Line Items]
Convertible senior notes, net	$ 482,200	$ 458,910
Convertible Debt
Debt Instrument [Line Items]
Principal amount	575,000	575,000	$ 575,000
Unamortized discount	(87,897)	(109,956)
Unamortized debt issuance cost	(4,903)	(6,134)
Carrying amount of the equity component	$ 148,598	$ 148,598
Effective interest rate	6.62%
Payments of offering costs	$ (3,000)		$ (3,000)

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Face (par) amount of debt instrument at time of issuance.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount.

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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.

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