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Debt and Financing Arrangements - Convertible Senior Notes (Details) - Senior Notes - Convertible Senior Notes Due 2023 $ / shares in Units, $ in Thousands | Feb. 27, 2018 | Feb. 23, 2018 USD ($) day $ / shares | Jul. 31, 2018 USD ($)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Fixed interest rate |  | 0.25% |
Net proceeds from notes |  | $ 335,000 |
Initial conversion rate of common stock | 0.0206795 |  |
Conversion price (in dollars per share) | $ / shares |  | $ 48.36 |
Limitation on sale of common stock, sale price threshold, number of trading days | day |  | 20 |
Limitation on sale of common stock, sale price threshold, trading period | day |  | 30 |
Threshold percentage of stock price trigger |  | 130.00% |
Number of consecutive business days |  | 5 days |
Percentage of closing sale price in excess of convertible notes |  | 98.00% |
Redemption price percentage |  | 100.00% |
Effective interest rate |  | 5.68% |
Issuance costs |  | $ 10,000 | $ 10,000
Issuance costs attributable to liability component |  |  | 7,700
Additional Paid-in Capital |  |  |
Debt Instrument [Line Items] |  |  |
Issuance costs attributable to equity component |  |  | $ 2,320

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