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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Customer concentration | Sales Revenue | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	76.00%	68.00%	66.00%
Customer concentration | Sales Revenue | US Army
Concentration of Credit Risk
Concentration Risk, Percentage	11.00%	6.00%	21.00%
Credit concentration | Accounts receivable balances | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	41.00%	42.00%

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