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RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Disclosure Text Block [Abstract]        
Operating Lease, Expense $ 500,000 $ 500,000 $ 1,000,000 $ 1,200,000
Operating Lease, Weighted Average Remaining Lease Term 7 years   7 years  
Operating Lease, Weighted Average Discount Rate, Percent 6.22%   6.22%