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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details)	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Customer concentration | Sales Revenue | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	68.00%	66.00%	69.00%
Customer concentration | Sales Revenue | US Army
Concentration of Credit Risk
Concentration Risk, Percentage	6.00%	21.00%	34.00%
Credit concentration | Accounts receivable balances | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	42.00%	65.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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