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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
Feb. 09, 2018 | Apr. 30, 2018 | Apr. 30, 2017
Equity [Abstract] |  |  |
Dividends on common stock | $ 1.5 | $ 1.5 | $ 1.5
Cash dividend, per share | $ 0.03 |  |
Dividends payable, date of record |  | Jan. 23, 2018 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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