Accrued Restructuring Charge (Summary Of Restructuring And Other Costs) (Details) $ in Thousands	Jul. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	$ 1,212
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	420
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	933
Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	127
Deferred Rent Liability [Member]
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	(356)
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Amounts incurred and expected to be incurred	$ 88