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Long-Term Debt - Convertible Notes Narrative (Details) | Nov. 01, 2019 USD ($) trading_day $ / shares | Oct. 30, 2019 USD ($) $ / shares | Nov. 30, 2019 USD ($) | Aug. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Offering-related costs |  |  | $ 12,486,000 | $ 5,706,000
Call Spread Transactions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage increase of strike price |  | 100.00% |  |
Equity component of issuance |  |  | 85,000,000.0 |
Equity component of issuance, net of tax |  |  | 64,100,000 |
Offering-related costs |  |  | 9,800,000 |
Deferred offering costs classified as liability |  |  | 7,200,000 |
Deferred offering costs classified as equity |  |  | 2,600,000 |
Call Spread Transactions | Warrant |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Strike price (in dollars per share) | $ / shares |  | $ 96.20 |  |
Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt amount | $ 300,000,000.0 |  | 300,000,000.0 |
Interest rate, stated percentage | 1.50% |  |  |
Proceeds from issuance of notes | $ 290,200,000 |  |  |
Conversion rate | 15.6906 |  |  |
Conversion price | $ / shares | $ 63.73 |  |  |
Number of consecutive trading days | trading_day | 30 |  |  |
Consecutive trading days | trading_day | 5 |  |  |
Convertible Notes | Call Spread Transactions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt amount |  |  | $ 215,000,000.0 |
Interest rate, stated percentage |  |  | 8.00% |
Proceeds from issuance of notes |  | $ 28,600,000 |  |
Convertible Notes | Convertible Note Hedge Transactions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Strike price (in dollars per share) | $ / shares |  | $ 63.73 |  |
Convertible Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of the conversion price | 130.00% |  |  |
Number of trading days | trading_day | 20 |  |  |
Convertible Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of the conversion price | 98.00% |  |  |

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