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Stock-Based Compensation - 2017 Market-Based RSAs and RSUs (Details) - 2017 Market-Based RSAs and RSUs - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jan. 17, 2017 | Sep. 30, 2018 | Jun. 30, 2018
Market-Based RSAs and RSUs |  |  |
Stock-based compensation |  |  |
Reversal of previously recognized compensation expense |  | $ 0.9 |
Market-Based RSAs |  |  |
Stock-based compensation |  |  |
Forfeited (in shares) |  | 120,060 |
Market-Based RSAs | Senior Management |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 353,508 |  |
Forfeited (in shares) |  |  | 233,448
Reversal of previously recognized compensation expense |  |  | $ 0.8
Market-Based RSUs |  |  |
Stock-based compensation |  |  |
Forfeited (in shares) |  | 53,360 |
Market-Based RSUs | Senior Management |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 53,360 |  |

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