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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		8 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2020	Jan. 31, 2018	Jan. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Apr. 30, 2018
Effective income tax rate [Abstract]
Effective Tax Rate as Reported		(18.10%)	3.20%			4.00%	49.50%
Estimated net impact in fiscal 2018 of non-recurring items from Tax Act		42.90%	0.00%			17.40%	0.00%
Impact of unfavorable German court decision in fiscal 2017		(0.00%)	(0.00%)			(0.00%)	(35.80%)
Impact of reduction in U.K. statutory rate on deferred tax balances in fiscal 2017		(0.00%)	(0.00%)			(0.00%)	4.40%
Effective Tax Rate excluding the impact of non-recurring items from the Tax Act in fiscal 2018 and the unfavorable German court decision and UK tax rate reduction in fiscal 2017		24.80%	3.20%			21.40%	18.10%
Income Tax Disclosure [Line Items]
Reduction in income tax expense resulting from estimated non-recurring items in the Tax Act						$ (25.0)
Reduction in income tax expense resulting from estimated non-recurring items in the Tax Act (in dollars per share)						$ 0.43
Federal statutory tax rate					35.00%
Tax benefit related to re-measurement of net deferred tax liability						$ (40.0)
Repatriation tax rate on foreign earnings held in cash equivalents and certain net assets						15.50%
Repatriation tax rate on foreign earnings held in other assets						8.00%
Provisional tax expense related to mandatory deemed repatriation tax on foreign earnings						$ 14.5
Plan [Member]
Income Tax Disclosure [Line Items]
Federal statutory tax rate				21.00%				30.40%
U.K. [Member]
Income Tax Disclosure [Line Items]
Foreign statutory tax rate in 2020						18.00%
U.K. [Member] | Plan [Member]
Income Tax Disclosure [Line Items]
Foreign statutory tax rate in 2020	17.00%
State [Member]
Income Tax Disclosure [Line Items]
Accrued provisional tax liability		$ 0.5				$ 0.5

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to favorable (unfavorable) foreign court decision.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to impact of increase (reduction) in foreign statutory rate on deferred tax balances.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding the impact of non-recurring items from the Tax Act and the foreign court decision and tax rate change.

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Percentage of foreign statutory tax rate applicable to pretax income (loss) during the fourth fiscal year following the latest fiscal year.

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Per share benefit from difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the non-recurring items.

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Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of income tax from transition tax on accumulated earnings held in other assets of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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