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Defined Benefit Pension Plans (Tables)
9 Months Ended
Jan. 31, 2021
Retirement Benefits [Abstract]  
Pension Expenses Pension expense consisted of the following (in thousands):
Three Months Ended January 31, 2021Three Months Ended January 31, 2020
Service cost$$
Interest cost181 208 
Expected return on plan assets(321)(355)
Recognition of net loss428 260 
Net periodic pension expense$288 $113 
Nine Months Ended January 31, 2021Nine Months Ended January 31, 2020
Service cost$$
Interest cost543 624 
Expected return on plan assets(963)(1,065)
Recognition of net loss1,285 780 
Net periodic pension expense$865 $339