Pension Benefits (Tables)

9 Months Ended

Jan. 31, 2013

Pension Benefits [Abstract]

Net Periodic Pension Cost

	Three Months Ended				Nine Months Ended
	January 31,				January 31,
(in thousands)	2013		2012		2013		2012
Service cost	$	0	$	1,326	$	0	$	3,892
Interest cost		1,565		1,633		4,696		4,986
Expected return on plan assets		(1,641)		(1,633)		(4,923)		(4,945)
Recognized net actuarial loss		231		428		692		1,472
Amortization of prior service cost		0		13		0		53
Curtailment expense		0		331		0		331
Net periodic pension cost	$	155	$	2,098	$	465	$	5,789