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Segment Reporting (Schedule Of Property And Equipment, By Domestic And Foreign Operations Segment) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011	Oct. 31, 2010
Segment Reporting Information [Line Items]
Property and equipment, net	$ 670,752	$ 586,346	$ 582,786
Domestic Operations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	549,998	497,521	505,411
Foreign Operations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 120,754	$ 88,825	$ 77,375

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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