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CONVERTIBLE SENIOR NOTES - Proceeds from Notes (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Debt Instrument [Line Items]
Payments for convertible note hedges				$ 0	$ (143,175)
Proceeds from issuance of warrants				0	87,975
Net proceeds					563,937
Convertible Debt
Debt Instrument [Line Items]
Principal amount		$ 575,000	$ 575,000	575,000	575,000	$ 575,000
Less: initial purchasers' discount			(10,781)		(10,781)
Payments for convertible note hedges	$ (143,175)
Proceeds from issuance of warrants	87,975
Debt issuance cost, gross, noncurrent			707		707
Less: other issuance costs		$ (390)	$ (366)	$ (1,152)	$ (404)
Net proceeds	$ 508,312

X

- Definition

Debt issuance costs incurred related to the convertible debt. It includes the amount of discount given to the initial purchasers' of the convertible debt. The total amount will be amortized over the term of the convertible debt.

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

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Amount of amortization expense attributable to debt issuance costs.

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Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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