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Convertible Senior Notes, Net - Schedule of Liability and Equity Component of 2023 and 2025 Notes (Details) - Senior Notes - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Convertible Senior Notes Due 2023
Liability component:
Principal	$ 120,588	$ 345,000
Less: unamortized debt issuance costs and debt discount	(19,885)
Net carrying amount	100,703
Convertible Senior Notes Due 2025
Liability component:
Principal	1,060,000
Less: unamortized debt issuance costs and debt discount	(222,998)
Net carrying amount	837,002
Additional Paid-in Capital | Convertible Senior Notes Due 2023
Equity component:
Notes	27,949
Less: issuance costs	(811)
Carrying amount of the equity component	27,138
Additional Paid-in Capital | Convertible Senior Notes Due 2025
Equity component:
Notes	221,387
Less: issuance costs	(4,040)
Carrying amount of the equity component	$ 217,347

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

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