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CONVERTIBLE SENIOR NOTES - Components of Notes (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018	Apr. 30, 2018
Debt Instrument [Line Items]
Convertible senior notes, net	$ 451,399	$ 429,598
Convertible Debt
Debt Instrument [Line Items]
Principal amount	575,000	575,000	$ 575,000
Unamortized discount	(117,070)	(137,719)
Unamortized debt issuance cost	(6,531)	(7,683)
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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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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