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Income Taxes (Details) - USD ($) $ in Millions			3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 31, 2018	Dec. 31, 2017	Apr. 30, 2018	Jan. 31, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Jul. 31, 2018
Tax benefits recognized provided percentage of likelihood of realization is more than						50.00%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 3.1		$ 4.0	$ 9.4	$ 106.7
Gross unrecognized tax benefit			$ 27.3			27.3
Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit				$ 10.6		$ 11.0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%	25.60%		30.90%	28.30%	2.90%
Foreign Earnings Repatriated						$ 93.9
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%							26.90%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	50.00%

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Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit

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Represents the tax benefits recognized provided percentage of likelihood of realization is more than during the period.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of foreign earnings repatriated from subsidiaries outside the country of domicile.

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Amount of unrecognized tax benefits.

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