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Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Jan. 31, 2016
Segment Reporting Information [Line Items]      
Total property and equipment, net $ 871,504 $ 899,324 $ 863,137
Total net sales 762,577 739,010  
Domestic Operations      
Segment Reporting Information [Line Items]      
Total property and equipment, net 749,072 755,890 742,171
Total net sales 673,364 649,718  
Foreign Operations      
Segment Reporting Information [Line Items]      
Total property and equipment, net 122,432 143,434 $ 120,966
Total net sales $ 89,213 $ 89,292