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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%

X

- Definition

Percentage of foreign statutory tax rate applicable to pretax income (loss).

+ References

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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

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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

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