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Defined Benefit Pension Plans (Tables)
3 Months Ended
Jul. 31, 2021
Retirement Benefits [Abstract]  
Pension Expenses
Pension (income) / expense consisted of the following (in thousands):
Three Months Ended
July 31, 2021July 31, 2020
Service cost$$
Interest cost177 181 
Expected return on plan assets(401)(321)
Recognition of net loss135 428 
Net periodic pension (income) expense$(89)$288