Stock-Based Compensation, President and CEO New Hire Equity Awards (Details) $ / shares in Units, $ in Millions	12 Months Ended
Apr. 30, 2021 USD ($) Installment $ / shares shares
ELTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted long-term incentive as percentage of base salary	300.00%
Targeted long-term incentive value \| $	$ 2.7
ELTIP [Member] \| PSU Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of targeted long-term incentive value	60.00%
Grant date fair value (in dollars per share) \| $ / shares	$ 59.15
Awards granted (in shares) \| shares	30,916
ELTIP [Member] \| Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of targeted long-term incentive value	40.00%
Grant date fair value (in dollars per share) \| $ / shares	$ 59.15
Awards granted (in shares) \| shares	20,611
ELTIP [Member] \| Restricted Share Units [Member] \| Vesting on April 30, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting percentage	25.00%
ELTIP [Member] \| Restricted Share Units [Member] \| Vesting on April 30, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting percentage	25.00%
ELTIP [Member] \| Restricted Share Units [Member] \| Vesting on April 30, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting percentage	25.00%
ELTIP [Member] \| Restricted Share Units [Member] \| Vesting on April 30, 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting percentage	25.00%
Sign-On Grant [Member] \| Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares	$ 59.15
Awards granted (in shares) \| shares	67,625
Grant value \| $	$ 4.0
Number of equal installments \| Installment	2

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- Definition

Refers to the percentage of targeted long-term incentive value.

+ References

No definition available.

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+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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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Percentage of vesting of award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Value, before forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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