Share-Based Payments (Details 2) - $ / shares	12 Months Ended
Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Restricted Shares and Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance, Restricted Shares and Deferred Stock Units and Performance Units	598,738
Granted	66,514	83,188	245,945
Vested	(179,584)
Forfeited	(54,613)
Ending Balance, Restricted Shares and Deferred Stock Units and Performance Units	431,055	598,738
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 116.54
Granted	135.10	$ 110.66	$ 121.19
Vested	121.07
Forfeited	118.71
Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 117.24	$ 116.54
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance, Restricted Shares and Deferred Stock Units and Performance Units	325,453
Granted	171,907	194,786	168,212
Vested	0
Forfeited	(34,883)
Ending Balance, Restricted Shares and Deferred Stock Units and Performance Units	462,477	325,453
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 118.21
Granted	135.53	$ 113.70	$ 123.68
Vested	0
Forfeited	123.90
Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 124.22	$ 118.21

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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.

+ References

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-Publisher FASB
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The number of grants made 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 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).

+ References

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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.

+ References

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-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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