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Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands | Jul. 31, 2018 USD ($) $ / shares
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Debt Instrument [Line Items] |
Closing price of common stock (in dollars per share) | $ / shares | $ 49.65
Convertible Senior Notes Due 2023 | Senior Notes |
Debt Instrument [Line Items] |
Aggregate principal amount | $ | $ 345,000

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