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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, 2020
Apr. 30, 2019
BENEFIT PLANS:    
Accumulated comprehensive loss, Pretax $ 11,896 $ 13,184
Net actuarial gain 2,678 (383)
Recognized settlement gain (2,929)  
Amortization of net loss (563) (905)
Accumulated comprehensive loss, Pretax 11,082 11,896
Accumulated comprehensive loss, Net of Tax 7,031 7,934
Net actuarial loss (gain) 1,868 (274)
Recognized settlement gain (2,049)  
Amortization of net loss (383) (629)
Accumulated comprehensive loss, Net of Tax $ (6,467) $ (7,031)