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Pension Benefits (Tables)
 3 Months Ended
Jul. 31, 2014
Pension and Other Postretirement Benefit Expense [Abstract]  
Net Periodic Pension Cost
Net periodic pension (benefit) cost consisted of the following for the three months ended July 31, 2014 and 2013: 
 

Three Months Ended
 

July 31,
(in thousands)

2014

2013
Interest cost

$
1,617


$
1,551

Expected return on plan assets

(1,917
)

(1,778
)
Recognized net actuarial loss

216


282








Net periodic pension (benefit) cost

$
(84
)

$
55