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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, 2014
Jan. 31, 2013
Jan. 31, 2012
Segment Reporting Information [Line Items]      
Total net sales $ 3,086,608 $ 2,794,925 $ 2,473,801
Total property and equipment, net 806,909 733,416  
Operating Segments
     
Segment Reporting Information [Line Items]      
Total net sales 3,086,608 2,794,925 2,473,801
Operating Segments | Domestic Operations
     
Segment Reporting Information [Line Items]      
Total net sales 2,685,042 2,423,155 2,169,976
Total property and equipment, net 655,866 586,068  
Operating Segments | Foreign Operations
     
Segment Reporting Information [Line Items]      
Total net sales 401,566 371,770 303,825
Total property and equipment, net $ 151,043 $ 147,348