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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, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Jan. 31, 2013
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 731,421 $ 722,058 $ 731,421 $ 722,058 $ 733,416
Total net sales 758,524 676,269 1,406,701 1,245,199  
Domestic Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 589,834 582,859 589,834 582,859 586,068
Total net sales 661,486 587,221 1,231,053 1,087,829  
Foreign Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 141,587 139,199 141,587 139,199 147,348
Total net sales $ 97,038 $ 89,048 $ 175,648 $ 157,370