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

 
$
0

Interest cost
181

 
208

Expected return on plan assets
(321
)
 
(355
)
Recognition of net loss
428

 
260

Net periodic pension expense
$
288

 
$
113