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v3.25.2

Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance | $ 6,289,000 | $ 5,878,000 |
Income taxes | 43,708,000 | 62,949,000 | $ 49,593,000
Payments for renewable energy credits | 36,200,000 |  |
Refunds received for renewable energy credits | 18,900,000 |  |
Foreign Tax Jurisdiction [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance | 300,000 |  |
Gross amount of state tax credit carryforwards | 2,600,000 | 2,400,000 |
State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Gross amount of state tax credit carryforwards | 3,700,000 | 3,700,000 |
Net deferred tax assets related to tax credit carryforwards | 100,000 | 200,000 |
State [Member] | Other Liabilities [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Deferred Tax Liability, Tax Credit Carryforwards, Net | $ 100,000 | $ 200,000 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Amount, before refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-23 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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