Pension Benefits (Tables)

6 Months Ended

Oct. 31, 2012

Pension Benefits [Abstract]

Net Periodic Pension Cost

	Three Months Ended				Six Months Ended
	October 31,				October 31,
(in thousands)	2012		2011		2012		2011
Service cost	$	0	$	1,283	$	0	$	2,566
Interest cost		1,565		1,677		3,130		3,353
Expected return on plan assets		(1,641)		(1,656)		(3,282)		(3,312)
Recognized net actuarial loss		231		522		462		1,044
Amortization of prior service cost		0		20		0		40
Net periodic pension cost	$	155	$	1,846	$	310	$	3,691