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Stock-Based Compensation, Performance-Based and Other Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Restricted Stock Awards [Member]
Restricted Shares [Roll Forward]
Nonvested Shares at Beginning of Year (in shares)	861	913	915
Granted (in shares)	415	525	509
Change in Shares Due to Performance (in shares)	(19)	(107)	(67)
Vested and Issued (in shares)	(357)	(318)	(267)
Forfeited (in shares)	(144)	(152)	(177)
Nonvested Shares at End of Year (in shares)	756	861	913	915
Weighted Average Grant Date Value [Abstract]
Nonvested Shares at Beginning of Year (in dollars per share)	$ 53.22
Granted (in dollars per share)	62.63
Change in Shares Due to Performance (in dollars per share)	44.17
Vested and Issued (in dollars per share)	54.95
Forfeited (in dollars per share)	55.37
Nonvested Shares at End of Year (in dollars per share)	$ 57.38	$ 53.22
Restricted Stock, Additional Disclosures [Abstract]
Unrecognized share-based compensation expense	$ 28.1
Award vesting period	4 years
Weighted average recognition period for unrecognized share-based compensation	2 years 2 months 12 days
Total grant date fair value of restricted shares vested	$ 19.6	$ 15.7	$ 12.1
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Annual Vesting on Anniversary of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				25.00%
Performance-based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for achievement of performance-based targets	3 years
Performance-based Restricted Stock Awards [Member] | Vesting on First Anniversary Date after Award Is Earned [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					50.00%
Performance-based Restricted Stock Awards [Member] | Vesting on Second Anniversary Date after Award Is Earned [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					50.00%
Performance-based Restricted Stock Awards [Member] | Vesting at End of Performance Cycle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50.00%
Performance-based Restricted Stock Awards [Member] | Vesting on April 30th of Year Following Performance Cycle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50.00%

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards that changed due to performance during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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