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Fair Value Measurements Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | Jan. 31, 2020 | Oct. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Closing price of common stock (in dollars per share) | $ 128.05 |
Convertible Senior Notes Due 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 120,588 | $ 345,000

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