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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Customer concentration | Sales Revenue | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	69.00%	61.00%	58.00%
Customer concentration | Sales Revenue | US Army
Concentration of Credit Risk
Concentration Risk, Percentage	34.00%	32.00%	28.00%
Credit concentration | Accounts receivable balances | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	64.00%	62.00%

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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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