Segment Information - Additional Information (Details) $ in Millions	12 Months Ended
Apr. 30, 2022 USD ($) Group supplyChain segment	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of major operating segments \| segment	3
Number of major product and service groups \| Group	6
Number of supply chain process areas \| supplyChain	7
International Customers
Segment Reporting Information [Line Items]
Total revenue \| $	$ 20.4	$ 16.7	$ 22.1
International Customers \| Total revenues \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of total revenue	16.00%	15.00%	19.00%

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