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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
	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2013
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 721,872	$ 711,932	$ 733,416
Total net sales	648,177	568,930
Domestic Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	579,644	570,663	586,068
Total net sales	569,567	500,608
Foreign Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	142,228	141,269	147,348
Total net sales	$ 78,610	$ 68,322

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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