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Pension Benefits (Tables)
 3 Months Ended
Jul. 31, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Net Periodic Pension (Benefit) Cost
Net periodic pension benefit cost consisted of the following for the three-month periods ended July 31, 2019 and 2018: 
 

Three Months Ended
 

July 31,
(in thousands)

2019

2018
Interest cost

$
1,493


$
1,567

Expected return on plan assets

(2,081
)

(2,127
)
Recognized net actuarial loss

423


412








Net periodic pension benefit

$
(165
)

$
(148
)