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Convertible Senior Notes - Carrying Amount of Equity Component (Details) - Convertible Debt - Convertible Senior Notes Due 2023 $ in Thousands	Apr. 30, 2019 USD ($)
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 134,667
Less: transaction costs	(3,336)
Net carrying amount	$ 131,331

X

- Definition

Debt Instrument, Convertible, Gross Amount Of Equity Component

+ References

No definition available.

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- Definition

Debt Issuance Costs, Equity Component Of Convertible Debt

+ References

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X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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- Definition

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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- Details

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