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Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Income Taxes (Additional Textual) [Abstract]
Undistributed earnings of foreign subsidiaries on which deferred income taxes not provided	$ 248.6
Time period over which it is reasonably possible that the Company could decrease its unrecognized tax benefits	12 months
Amount unrecognized tax benefit could decrease in next 12 months	$ 2.1
Company's unrecognized tax benefits	45.0	$ 29.1	$ 29.7	$ 24.0
Unrecognized tax benefits that would affect the effective tax rate	32.2	19.5	20.6
Tax-related net interest and penalties	3.4	2.0	2.0
Interest charged to earnings	0.7	$ 0.1	$ 0.3
Federal [Member]
Schedule Of Tax Carryforwards [Line Items]
Valuation allowance on operating loss carryforward	$ 4.2

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Additional income taxes textuals.

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Interest charged to earnings

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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