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BENEFIT PLANS: (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Benefit obligation at beginning of year $ 36,469 $ 38,582    
Interest cost 1,370 1,294    
Actuarial (gain) loss 5,098 (1,009)    
Benefits paid (4,634) (2,398)    
Benefit obligation at end of year 38,303 36,469    
Change in plan assets:        
Fair value of plan assets at beginning of year 29,120 24,777    
Company contributions 475 3,718    
Actual return on plan assets 2,334 3,268    
Benefits paid (4,634) (2,398)    
Plan expenses (251) (245)    
Fair value of plan assets at end of year 29,120 24,777 $ 27,044 $ 29,120
Funded (underfunded) status:     $ (11,259) $ (7,349)
Recognition of underfunded status:        
Accrued pension cost $ (11,259) $ (7,349)