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Preferred Stock Preferred Stock (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 15, 2019 shares | Mar. 29, 2020 USD ($) | Mar. 31, 2019 USD ($) | Jul. 02, 2017 USD ($) | Dec. 31, 2017 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |
Preferred stock dividends | $ |  | $ 0 | $ 8,733 |  |
Depository Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Depository shares issued (in shares) |  |  |  |  | 5,200,000
Interest in preferred stock per depository share |  |  |  |  | 0.01
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage of issued shares |  |  |  |  | 6.75%
Offering price per share (in usd per share) | $ / shares |  |  |  |  | $ 100
Preferred stock converted in to common stock (in shares) | 132.50 |  |  |  |
Number of common stock issued upon conversion (in shares) | 6,900,000 |  |  |  |
Proceeds from offering, net | $ |  |  |  | $ 501,000 |

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