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Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Jan. 31, 2015
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 900,302 $ 868,642 $ 900,302 $ 868,642 $ 889,232
Total net sales 867,460 811,253 1,606,470 1,497,563  
Domestic Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 760,042 712,987 760,042 712,987 745,504
Total net sales 756,487 701,763 1,406,205 1,302,675  
Foreign Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 140,260 155,655 140,260 155,655 $ 143,728
Total net sales $ 110,973 $ 109,490 $ 200,265 $ 194,888