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Income Taxes (Narrative) (Details) - State [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016
Tax Credit Carryforward [Line Items] |  |
Gross amount of state tax credit carryforwards | $ 6.1 | $ 5.8
Net deferred tax assets related to tax credit carryforwards | 1.6 | 1.8
Other Liabilities [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Net deferred tax assets related to tax credit carryforwards | 1.5 | $ 1.8
Investment Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Decrease in valuation allowance | $ (0.6) |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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