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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 07, 2018 | Feb. 09, 2018 | Jul. 31, 2018 | Jul. 31, 2017
Class of Stock [Line Items] |  |  |  |
Dividends on common stock |  | $ 1.5 | $ 1.5 | $ 1.5
Cash dividend, per share |  | $ 0.03 |  |
Dividends payable, date of record |  |  | Jul. 23, 2018 |
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends on common stock | $ 1.5 |  |  |
Cash dividend, per share | $ 0.03 |  |  |

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