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Stock-Based Compensation Restricted Stock Awards (Details)	12 Months Ended
	Apr. 30, 2023 $ / shares shares
Restricted stock awards | 2021 Plan
Shares
Unvested stock at beginning of year (in shares) | shares	45,076
Stock granted (in shares) | shares	78,819
Stock vested (in shares) | shares	(23,728)
Stock canceled (in shares) | shares	(4,568)
Unvested stock at end of year (in shares) | shares	95,599
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) | $ / shares	$ 75.71
Stock granted (in dollars per shares) | $ / shares	78.41
Stock vested (in dollars per shares) | $ / shares	43.51
Stock canceled (in dollars per shares) | $ / shares	76.52
Unvested stock at end of year (in dollars per share) | $ / shares	$ 85.90
Restricted stock awards | Restated 2006 Plan
Shares
Unvested stock at beginning of year (in shares) | shares	112,845
Stock vested (in shares) | shares	(61,857)
Stock canceled (in shares) | shares	(6,908)
Unvested stock at end of year (in shares) | shares	44,080
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) | $ / shares	$ 89.80
Stock vested (in dollars per shares) | $ / shares	82.44
Stock canceled (in dollars per shares) | $ / shares	93.13
Unvested stock at end of year (in dollars per share) | $ / shares	$ 99.62
Restricted stock units | Restated 2021 Plan
Shares
Stock granted (in shares) | shares	814
Unvested stock at end of year (in shares) | shares	814
Weighted Average Grant Date Fair Value
Stock granted (in dollars per shares) | $ / shares	$ 85.91
Unvested stock at end of year (in dollars per share) | $ / shares	$ 85.91
Restricted stock units | Restated 2006 Plan
Shares
Unvested stock at beginning of year (in shares) | shares	4,395
Stock vested (in shares) | shares	(1,349)
Stock canceled (in shares) | shares	(358)
Unvested stock at end of year (in shares) | shares	2,688
Weighted Average Grant Date Fair Value
Unvested stock at beginning of year (in dollars per share) | $ / shares	$ 97.96
Stock vested (in dollars per shares) | $ / shares	97.96
Stock canceled (in dollars per shares) | $ / shares	97.96
Unvested stock at end of year (in dollars per share) | $ / shares	$ 97.69

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (c)(2)(i)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(02)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (c)(2)(iii)(02)
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