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Pension Benefits (Tables)
 3 Months Ended
Jul. 31, 2015
Pension and Other Postretirement Benefit Expense [Abstract]  
Net Periodic Pension Cost
Net periodic pension (benefit) cost consisted of the following for the three-month periods ended July 31, 2015 and 2014: 
 

Three Months Ended
 

July 31,
(in thousands)

2015

2014
Interest cost

$
1,754


$
1,617

Expected return on plan assets

(2,036
)

(1,917
)
Recognized net actuarial loss

353


216








Net periodic pension (benefit) cost

$
71


$
(84
)