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v3.19.1

Fair Value Measurements - Narrative (Details) | Apr. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($)
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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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