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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 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Jan. 31, 2013
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 783,662 $ 734,793 $ 783,662 $ 734,793 $ 733,416
Total net sales 774,049 692,894 2,180,750 1,938,093  
Domestic Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 632,271 588,348 632,271 588,348 586,068
Total net sales 677,119 602,810 1,908,172 1,690,638  
Foreign Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 151,391 146,445 151,391 146,445 147,348
Total net sales $ 96,930 $ 90,084 $ 272,578 $ 247,455