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Debt and Available Credit Facilities - Interest Expense in Unaudited Condensed Consolidated Statements of Net Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
Amended and Restated RCA |  |  |
Line of Credit Facility [Line Items] |  |  |
Amortization expense | $ 1,137 | $ 1,145 | $ 1,246

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