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Pension Benefits (Tables)
 9 Months Ended
Jan. 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- and nine-month periods ended January 31, 2016 and 2015: 
 

Three Months Ended

Nine Months Ended
 

January 31,

January 31,
(in thousands)

2016

2015

2016

2015
Interest cost

$
1,754


$
1,617


$
5,260


$
4,850

Expected return on plan assets

(2,036
)

(1,917
)

(6,106
)

(5,750
)
Recognized net actuarial loss

353


216


1,059


649














Net periodic pension (benefit) cost

$
71


$
(84
)

$
213


$
(251
)