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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details) | 12 Months Ended
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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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