Accrued Restructuring Charge (Schedule Of Accrued Liability Associated With Realignment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	$ 560
Charges	117
Payments	(358)
Adjustments	33
Accrued liability at July 31, 2014	352
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	96
Payments	(96)
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability at April 30, 2014	464
Charges	117
Payments	(262)
Adjustments	33
Accrued liability at July 31, 2014	$ 352