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v3.22.2

Changes in Accounting Estimates (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Compensation expense | $ 5,390,000 | $ 6,932,000 | $ 6,227,000
Adoption of ASU 2018-09 |  |  |
Compensation expense | 1,602,000 |  |
TMS contract |  |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | (1,124,000) | $ (1,041,000) |
TMS contract | Revision of estimate of total costs required to complete the contracts | Cumulative catch-up adjustment |  |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | $ (1,403,000) |  | (1,403,000)
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods increased |  |  | $ 1,099,000

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