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Defined Benefit Pension Plans (Tables)
9 Months Ended
Jan. 31, 2020
Retirement Benefits [Abstract]  
Pension Expenses
Pension expense consisted of the following (in thousands):
 
Three Months Ended January 31, 2020
 
Three Months Ended January 31, 2019
Service cost
$
0

 
$
0

Interest cost
208

 
214

Expected return on plan assets
(355
)
 
(362
)
Recognition of net loss
260

 
221

Net periodic pension expense
$
113

 
$
73

 
Nine Months Ended January 31, 2020
 
Nine Months Ended January 31, 2019
Service cost
$
0

 
$
0

Interest cost
624

 
644

Expected return on plan assets
(1,065
)
 
(1,086
)
Recognition of net loss
780

 
663

Net periodic pension expense
$
339

 
$
221