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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details) | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Customer concentration | Sales Revenue | US Government Agencies |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk, Percentage | 61.00% | 58.00% | 58.00%
Customer concentration | Sales Revenue | US Army |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk, Percentage | 32.00% | 28.00% | 19.00%
Credit concentration | Accounts receivable balances | US Government Agencies |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk, Percentage | 62.00% | 26.00% |

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