Stock-Based Compensation Restricted Stock Awards (Details)	12 Months Ended
Apr. 30, 2025 $ / shares shares
Restricted stock awards \| 2021 Plan
Shares
Unvested stock at beginning of year (in shares) \| shares	191,607
Stock granted (in shares) \| shares	57,497
Stock vested (in shares) \| shares	(76,511)
Stock canceled (in shares) \| shares	(10,453)
Unvested stock at end of year (in shares) \| shares	162,140
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) \| $ / shares	$ 101.38
Stock granted (in dollars per shares) \| $ / shares	174.46
Stock vested (in dollars per shares) \| $ / shares	97.79
Stock canceled (in dollars per shares) \| $ / shares	118.72
Unvested stock at end of year (in dollars per share) \| $ / shares	$ 127.71
Restricted stock awards \| Restated 2006 Plan
Shares
Unvested stock at beginning of year (in shares) \| shares	9,902
Stock vested (in shares) \| shares	(9,902)
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) \| $ / shares	$ 94.67
Stock vested (in dollars per shares) \| $ / shares	$ 94.67
Restricted stock units \| Restated 2021 Plan
Shares
Unvested stock at beginning of year (in shares) \| shares	3,415
Stock granted (in shares) \| shares	992
Stock vested (in shares) \| shares	(1,229)
Unvested stock at end of year (in shares) \| shares	3,178
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) \| $ / shares	$ 101.38
Stock granted (in dollars per shares) \| $ / shares	175.67
Stock vested (in dollars per shares) \| $ / shares	100.26
Unvested stock at end of year (in dollars per share) \| $ / shares	$ 125
Restricted stock units \| Restated 2006 Plan
Shares
Unvested stock at beginning of year (in shares) \| shares	1,349
Stock vested (in shares) \| shares	(1,349)
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) \| $ / shares	$ 97.69
Stock vested (in dollars per shares) \| $ / shares	$ 97.69

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

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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.

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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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- Definition

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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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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.

+ Details

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- Definition

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

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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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- 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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