Property And Equipment (Components Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 875,298	$ 833,953
Less: Accumulated depreciation and amortization	(622,313)	(578,655)
Property and equipment net	252,985	255,298
Land And Other Non-Depreciable Assets [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,892	2,245
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	147,795	154,519
Computers And Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	419,101	390,599
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	130,027	123,885
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	174,432	160,743
Construction In Process [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,051	$ 1,962

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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