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Defined Benefit Pension Plans (Tables)
9 Months Ended
Jan. 31, 2019
Retirement Benefits [Abstract]  
Pension Expenses
Pension expense consisted of the following (in thousands): 
 
Three Months Ended January 31, 2019
 
Three Months Ended January 31, 2018
Service cost
$
0

 
$
0

Interest cost
214

 
219

Expected return on plan assets
(362
)
 
(328
)
Recognition of net loss
221

 
283

Net periodic pension expense
$
73

 
$
174

 
Nine Months Ended January 31, 2019
 
Nine Months Ended
January 31, 2018
Service cost
$
0

 
$
0

Interest cost
644

 
657

Expected return on plan assets
(1,086
)
 
(984
)
Recognition of net loss
663

 
849

Net periodic pension expense
$
221

 
$
522