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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Effective income tax rate [Abstract] |  |
Effective tax rate as reported | 68.60% | 45.10%
U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Non-cash deferred tax expense from re-measurement of net deferred tax liabilities | $ 20.7 | $ 6.7
Minimum [Member] | U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Foreign statutory tax rate | 19.00% | 17.00%
Maximum [Member] | U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Foreign statutory tax rate | 25.00% | 19.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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