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BENEFIT PLANS: - Changes in the pension plan's benefit obligation and assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
BENEFIT PLANS:    
Benefit obligation at beginning of year $ 30,304 $ 32,423
Interest cost 716 1,183
Actuarial loss (gain) 1,550 (966)
Benefits paid (2,050) (2,336)
Settlement paid (7,246)  
Benefit obligation at end of year 23,274 30,304
Change in plan assets:    
Fair value of plan assets at beginning of year 23,903 23,372
Actual return on plan assets 393 1,277
Company contributions 3,600 2,000
Benefits paid (2,050) (2,336)
Settlement paid (7,246)  
Plan expenses (340) (410)
Fair value of plan assets at end of year 18,260 23,903
Underfunded status (5,014) (6,401)
Recognition of underfunded status:    
Accrued pension cost $ (5,014) $ (6,401)