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Income Taxes (Narrative) (Details) £ in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 19, 2018 GBP (£) | Dec. 20, 2017 GBP (£) | Apr. 30, 2018 USD ($) | Apr. 30, 2017 | Apr. 30, 2018 GBP (£) | Apr. 30, 2018 USD ($) | Apr. 30, 2017 | Oct. 31, 2018 | Oct. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Repatriation tax |  |  |  |  |  | $ 177.9 |  |  |
Provisional tax expense |  |  |  |  |  | 13.2 |  |  |
Current state and local tax expense (benefit) |  |  |  |  |  | 8.1 |  |  |
Withholding taxes relating to the unremitted foreign earnings |  |  | $ 2.8 |  |  | $ 2.8 |  |  |
Effective income tax rate |  |  | 12.90% | 4.20% | 147.80% | 147.80% | 4.70% |  |
Effective tax rate increase |  |  |  |  |  | $ 202.0 |  |  |
Unrecognized tax benefits |  |  | $ 63.6 |  |  | 63.6 |  |  | $ 59.9
Unrecognized tax benefits that could be settled |  |  | $ 6.1 |  |  | $ 6.1 |  |  |
UNITED KINGDOM |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Diverted profit tax | £ |  | £ 31.0 |  |  | £ 31.0 |  |  |  |
Payment for DPT | £ | £ 31.0 |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Blended tax rate |  |  |  |  |  |  |  | 23.34% |

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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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