CONTRACT (LIABILITIES) ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
CONTRACT (LIABILITIES) ASSETS (Details) [Line Items]
Increase (Decrease) in Contract with Customer, Asset			$ 2,500
Increase (Decrease) in Contract with Customer, Liability			(2,200)
Revenues	$ 13,575	$ 8,949	25,984	$ 17,153
Loss on Contracts	1,400	700	1,500	2,000
Contract Liabilities [Member]
CONTRACT (LIABILITIES) ASSETS (Details) [Line Items]
Revenues	4,400	1,900	8,100	4,400
Contracts Accounted for under Percentage of Completion [Member]
CONTRACT (LIABILITIES) ASSETS (Details) [Line Items]
Revenues	$ 12,300	$ 8,700	$ 24,000	$ 16,600