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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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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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- Definition

Price of a single share of a number of saleable stocks of a company.

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