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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 31, 2021	Jul. 31, 2020	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Apr. 30, 2015
Effective income tax rate [Abstract]
Effective tax rate as reported	19.10%		20.70%	14.90%	20.30%
Corporate tax rate						35.00%
Tax benefit resulting from NOL carryback				$ 14.0
U.K. [Member]
Effective income tax rate [Abstract]
Non-cash deferred tax expense		$ 6.7
Prepaid Expenses and Other Current Assets [Member]
Effective income tax rate [Abstract]
Refund in connection with NOL carryback	$ 20.7			$ 20.7
Minimum [Member] | U.K. [Member]
Effective income tax rate [Abstract]
Foreign statutory tax rate		17.00%
Maximum [Member] | U.K. [Member]
Effective income tax rate [Abstract]
Foreign statutory tax rate		19.00%

X

- Definition

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

+ References

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- Definition

The amount of income tax benefit resulting from net operating loss carryback.

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The amount of refund in connection with net operating losses carryback.

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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=84230637&loc=d3e32687-109319

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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