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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	Jul. 31, 2020	Apr. 30, 2020
Costs and Estimated Earnings in Excess of Billings, Net [Abstract]
Costs and estimated earnings in excess of billings	$ 17,466	$ 10,460
Billings in excess of costs and estimated earnings	(10,534)	(3,507)
Net asset	$ 6,932	$ 6,953

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

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