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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
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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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