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Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 722,058	$ 626,188	$ 722,058	$ 626,188	$ 684,979
Total net sales	676,269	609,181	1,245,199	1,133,200
Domestic Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	582,859	517,430	582,859	517,430	557,512
Total net sales	587,221	535,055	1,087,829	1,001,906
Foreign Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	139,199	108,758	139,199	108,758	127,467
Total net sales	$ 89,048	$ 74,126	$ 157,370	$ 131,294

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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