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Pension Benefits (Tables)
 9 Months Ended
Jan. 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- and nine-month periods ended January 31, 2015 and 2014: 
 

Three Months Ended

Nine Months Ended
 

January 31,

January 31,
(in thousands)

2015

2014

2015

2014
Interest cost

$
1,617


$
1,551


$
4,850


$
4,652

Expected return on plan assets

(1,917
)

(1,778
)

(5,750
)

(5,335
)
Recognized net actuarial loss

216


282


649


847














Net periodic pension (benefit) cost

$
(84
)

$
55


$
(251
)

$
164