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Segment Reporting (Schedule Of Revenues And Long-Lived Assets, By Domestic And Foreign Operations Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Jan. 31, 2012
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 711,932	$ 601,249	$ 684,979
Total net sales	568,930	524,019
Domestic Operations [Member]
Segment Reporting Information [Line Items]
Total property and equipment, net	570,663	499,025	557,512
Total net sales	500,608	466,851
Foreign Operations [Member]
Segment Reporting Information [Line Items]
Total property and equipment, net	141,269	102,224	127,467
Total net sales	$ 68,322	$ 57,168

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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