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REVENUES - Other revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Other revenues    
Sales of buildings and other land $ 8,439 $ 9,493
Oil and gas royalties 276 135
Infrastructure reimbursements 1,189 1,228
Miscellaneous other revenues 446 959
Other Revenue, Net $ 10,350 $ 11,815