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Pension Benefits (Tables)
 3 Months Ended
Jul. 31, 2016
Pension and Other Postretirement Benefit Expense [Abstract]  
Net Periodic Pension (Benefit) Cost
Net periodic pension (benefit) cost consisted of the following for the three-month periods ended July 31, 2016 and 2015: 
 

Three Months Ended
 

July 31,
(in thousands)

2016

2015
Interest cost

$
1,443


$
1,754

Expected return on plan assets

(2,020
)

(2,036
)
Recognized net actuarial loss

443


353








Net periodic pension (benefit) cost

$
(134
)

$
71