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BENEFIT PLANS - changes in accumulated other comprehensive loss related to the pension plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
BENEFIT PLANS    
Accumulated comprehensive loss, Pretax $ 11,082 $ 11,896
Net actuarial gain (2,127) 2,678
Recognized settlement gain   (2,929)
Amortization of net loss (529) (563)
Accumulated comprehensive loss, Pretax 8,426 11,082
Accumulated comprehensive loss, Net of Tax 6,467 7,031
Net actuarial loss (gain) (1,483) 1,868
Recognized settlement gain   (2,049)
Amortization of net loss (361) (383)
Accumulated comprehensive loss, Net of Tax $ 4,623 $ 6,467