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COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Details) - Costs and Estimated Earnings in Excess of Billings, Net - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021
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Costs and Estimated Earnings in Excess of Billings, Net [Abstract] |  |
Costs and estimated earnings in excess of billings | $ 9,882 | $ 12,640
Billings in excess of costs and estimated earnings | (13,361) | (10,692)
Net (liability) asset | $ (3,479) | $ 1,948

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