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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, 2022
Apr. 30, 2021
BENEFIT PLANS    
Accumulated comprehensive loss, Pretax $ 8,426 $ 11,082
Net actuarial gain 316 (2,127)
Amortization of net loss $ (392) $ (529)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Costs and Expenses, Total Costs and Expenses, Total
Accumulated comprehensive loss, Pretax $ 8,350 $ 8,426
Accumulated comprehensive loss, Net of Tax 4,623 6,467
Net actuarial loss (gain) 214 (1,483)
Amortization of net loss (264) (361)
Accumulated comprehensive loss, Net of Tax $ 4,573 $ 4,623