Share-Based Payments (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs for stock options	$ 23.5	$ 22.9	$ 21.3
Related income tax benefit	$ 8.0	7.7	7.1
Weighted-average period of recognition	2 years 6 months
Intrinsic value of options exercised	$ 1.9	0.8	3.4
Restricted stock, vesting period (in Years)	4 years
Fair value of equity awards other than stock options vesting	$ 43.4	40.2	15.4
Options granted in period gross	955,000
Outstanding at April 30, 2015, average remaining contractual term	9 years 11 months
Outstanding at April 30, 2015, aggregate intrinsic value	$ 3.3
Exercisable at April 30, 2015, average remaining contractual term	4 months
Exercisable at April 30, 2015, aggregate intrinsic value	$ 0.1
Closing market price	$ 115.92
Unrecognized compensation expense	$ 18.5
Cash received from option exercises	$ 0.8	0.5	2.2
Shares available for future issuance	5,820,288
Equity instruments other than options vested in period weighted average grant date fair value total value	$ 28.6	$ 20.8	$ 11.8
2015 Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option contractual term	10 years
Weighted average fair value of stock options granted	$ 21.68
2015 Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service and performance period for share based payments	1 year
2015 Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service and performance period for share based payments	3 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs for stock options	$ 1.2
Related income tax benefit	$ 0.4
Weighted-average period of recognition	2 years

The requisite service and performance period for stock options issued in 2015

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The total value of the share based compensation arrangement by share based payment award equity instruments other than options vested in period weighted average grant date fair value.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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