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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2018 | Apr. 30, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Provisional expense | $ 1.6 | $ 1.0 |  |
State [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Gross amount of state tax credit carryforwards |  | 5.2 | $ 5.2 | $ 6.1
Net deferred tax assets related to tax credit carryforwards |  | 1.5 | 1.5 | 1.6
State [Member] | Other Liabilities [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net deferred tax assets related to tax credit carryforwards |  | $ 1.3 | 1.3 | $ 1.5
Investment Tax Credit Carryforward [Member] | State [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Decrease in valuation allowance |  |  | $ 0.0 |

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