Summary Of Property, Plant, And Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Property, Plant and Equipment [Line Items]
Computer equipment and furniture	$ 284,191	$ 265,450
Buildings and building equipment	85,704	75,211
Land and improvements	21,179	21,044
Leasehold improvements	36,998	35,211
Property, Plant and Equipment, Gross, Total	428,072	396,916
Less accumulated depreciation and amortization	(280,053)	(257,576)
Property, plant, and equipment, net	$ 148,019	$ 139,340

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, 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.

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- Definition

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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