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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, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 886,810 $ 783,662 $ 886,810 $ 783,662 $ 806,909
Total net sales 814,470 774,049 2,312,033 2,180,750  
Domestic Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 731,579 632,271 731,579 632,271 655,866
Total net sales 706,090 677,119 2,008,765 1,908,172  
Foreign Operations
          
Segment Reporting Information [Line Items]          
Total property and equipment, net 155,231 151,391 155,231 151,391 151,043
Total net sales $ 108,380 $ 96,930 $ 303,268 $ 272,578