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Defined Benefit Pension Plans (Tables)
6 Months Ended
Oct. 31, 2020
Retirement Benefits [Abstract]  
Pension Expenses Pension expense consisted of the following (in thousands):
Three Months Ended October 31, 2020Three Months Ended October 31, 2019
Service cost$$
Interest cost181 208 
Expected return on plan assets(321)(355)
Recognition of net loss429 260 
Net periodic pension expense$289 $113 
Six Months Ended October 31, 2020Six Months Ended October 31, 2019
Service cost$$
Interest cost362 416 
Expected return on plan assets(642)(710)
Recognition of net loss857 520 
Net periodic pension expense$577 $226