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Description of the Business and Summary of Significant Accounting Policies and Practices - Convertible Senior Notes (Details) - 2.00% Convertible Senior Notes Due 2024 - Senior notes | Apr. 30, 2019 USD ($)
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Summary of Significant Accounting Policies |
Convertible debt issued | $ 300,000,000
Interest rate (as a percent) | 2.00%

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