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v3.20.1

Changes in Accounting Estimates (Details) - Revision of estimate of total costs required to complete the contracts - Cumulative catch-up adjustment - USD ($) $ in Thousands | 12 Months Ended |
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Apr. 30, 2020 | Apr. 30, 2018
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods |  | $ 1,255
Design and development agreement |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | $ 1,099 |
TMS contract |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | $ (1,403) |

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- Definition Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods + References No definition available. + Details
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