Contract (Liabilities) Assets, Net (Details) - Contracts Accounted for under Percentage of Completion [Member] - USD ($) $ in Millions	12 Months Ended
Apr. 30, 2022	Apr. 30, 2021
Contract (Liabilities) Assets, Net (Details) [Line Items]
Revenues	$ 46.4	$ 50.2
Anticipated Loss on Contracts	$ 4.2	$ 1.0

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details