Property and Equipment (Components of Property and Equipment) (Details) (USD $) In Thousands	Apr. 30, 2011	Apr. 30, 2010
Property and Equipment
Land and other non-depreciable assets	$ 2,245	$ 2,482
Buildings	154,519	161,460
Computers and other equipment	475,351	488,160
Capitalized software	156,108	147,104
Leasehold improvements	191,943	199,370
Construction in process	4,374	3,902
Property and equipment, gross	984,540	1,002,478
Less: Accumulated depreciation and amortization	(677,220)	(657,008)
Property and equipment net	$ 307,320	$ 345,470

Computers and Other Equipment

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Land and Other Non-depreciable Assets

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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.

+ References

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- Definition

Gross amount, as of the balance sheet date, of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing.

+ References

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- Definition

The gross amount of capitalized computer software costs as of the balance sheet date.

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Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

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Gross amount, at the balance sheet date, of long-lived, depreciable assets that are an addition or improvement to assets held under lease arrangement.

+ References

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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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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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