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Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Segment Reporting Information [Line Items]
Total net sales	$ 2,794,925	$ 2,473,801	$ 2,274,102
Total property and equipment, net	733,416	684,979
Domestic Operations
Segment Reporting Information [Line Items]
Total net sales	2,423,155	2,169,976	2,027,074
Total property and equipment, net	586,068	557,512
Foreign Operations
Segment Reporting Information [Line Items]
Total net sales	371,770	303,825	247,028
Total property and equipment, net	$ 147,348	$ 127,467

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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