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Property And Equipment (Property And Equipment Subject To Capital Lease) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Property, Plant and Equipment, Net [Abstract]
Property and equipment under capital lease	$ 43,778	$ 47,842
Less accumulated amortization	(33,584)	(36,740)
Property and equipment under capital lease, net	$ 10,194	$ 11,102

Property, plant, or equipment held under lease agreements classified as an asset.

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.