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Fair Value Measurements - Narrative (Details)	Apr. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of available-for-sale securities | security	155
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 615,400,000
Convertible Debt | Convertible Senior Notes Due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt interest rate percentage	0.50%
Aggregate principal amount of debt issued	$ 575,000,000.0	$ 575,000,000.0

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
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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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