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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, 2014
Apr. 30, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]      
Total property and equipment, net $ 836,244 $ 721,872 $ 806,909
Total net sales 686,310 648,177  
Domestic Operations
      
Segment Reporting Information [Line Items]      
Total property and equipment, net 685,195 579,644 655,866
Total net sales 600,913 569,567  
Foreign Operations
      
Segment Reporting Information [Line Items]      
Total property and equipment, net 151,049 142,228 151,043
Total net sales $ 85,397 $ 78,610