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Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 07, 2020 | Feb. 10, 2020 | Jul. 31, 2020 | Jan. 31, 2020 | Jul. 31, 2019 | Jan. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends on common stock |  | $ 1.5 |  |  |  |  | $ 1.5 | $ 1.5
Dividends on common stock (in dollars per share) |  | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 |  |
Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends on common stock | $ 1.5 |  |  |  |  |  |  |
Dividends on common stock (in dollars per share) | $ 0.03 |  |  |  |  |  |  |

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