Product Warranty (Tables)

6 Months Ended

Oct. 31, 2012

Product Warranty [Abstract]

Schedule Of Warranty Liability

	Six Months Ended
	October 31,
(in thousands)	2012		2011
Beginning balance at May 1	$	1,885	$	1,738
Accrual		4,953		4,432
Settlements		(4,747)		(4,392)
Ending balance at October 31	$	2,091	$	1,778