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Pension Benefits (Tables)
 6 Months Ended
Oct. 31, 2018
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, 2018 and 2017: 
 

Three Months Ended

Six Months Ended
 

October 31,

October 31,
(in thousands)

2018

2017

2018

2017
Interest cost

$
1,568


$
1,432


$
3,135


$
2,864

Expected return on plan assets

(2,128
)

(2,234
)

(4,255
)

(4,468
)
Recognized net actuarial loss

412


400


824


800














Net periodic pension benefit

$
(148
)

$
(402
)

$
(296
)

$
(804
)