Accrued Restructuring Charge (Summary Of Restructuring And Other Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	$ 1,041
Amounts incurred for fiscal 2014	1,035
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	420
Amounts incurred for fiscal 2014	414
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	783
Amounts incurred for fiscal 2014	783
Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	127
Amounts incurred for fiscal 2014	127
Deferred Rent Liability [Member]
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	(356)
Amounts incurred for fiscal 2014	(356)
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Amounts expected to be incurred	67
Amounts incurred for fiscal 2014	$ 67