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Pension Benefits (Tables)
 6 Months Ended
Oct. 31, 2017
Pension and Other Postretirement Benefit Expense [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, 2017 and 2016: 
 

Three Months Ended

Six Months Ended
 

October 31,

October 31,
(in thousands)

2017

2016

2017

2016
Interest cost

$
1,432


$
1,443


$
2,864


$
2,886

Expected return on plan assets

(2,234
)

(2,019
)

(4,468
)

(4,039
)
Recognized net actuarial loss

400


442


800


885














Net periodic pension benefit

$
(402
)

$
(134
)

$
(804
)

$
(268
)