Pension Benefits (Tables)

9 Months Ended

Jan. 31, 2014

Pension Benefits [Abstract]

Net Periodic Pension Cost

	Three Months Ended				Nine Months Ended
	January 31,				January 31,
(in thousands)	2014		2013		2014		2013
Interest cost	$	1,551	$	1,565	$	4,652	$	4,696
Expected return on plan assets		(1,778)		(1,641)		(5,335)		(4,923)
Recognized net actuarial loss		282		231		847		692
Net periodic pension cost	$	55	$	155	$	164	$	465