Accrued Restructuring Charge (Schedule Of Accrued Liability Associated With Realignment) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	$ 560
Payments, net	(266)
Adjustments	33
Accrued liability at October 31, 2014	327
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	96
Payments, net	(96)
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	464
Payments, net	(170)
Adjustments	33
Accrued liability at October 31, 2014	$ 327