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Pension Benefits (Tables)
 6 Months Ended
Oct. 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- and six-month periods ended October 31, 2019 and 2018: 
 

Three Months Ended

Six Months Ended
 

October 31,

October 31,
(in thousands)

2019

2018

2019

2018
Interest cost

$
1,494


$
1,568


$
2,987


$
3,135

Expected return on plan assets

(2,082
)

(2,128
)

(4,163
)

(4,255
)
Recognized net actuarial loss

423


412


846


824














Net periodic pension benefit

$
(165
)

$
(148
)

$
(330
)

$
(296
)