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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, 2017
Apr. 30, 2016
Jan. 31, 2017
Segment Reporting Information [Line Items]      
Total property and equipment, net $ 851,259 $ 871,504 $ 867,786
Total net sales 761,190 762,577  
Domestic Operations      
Segment Reporting Information [Line Items]      
Total property and equipment, net 754,965 749,072 766,419
Total net sales 677,953 673,364  
Foreign Operations      
Segment Reporting Information [Line Items]      
Total property and equipment, net 96,294 122,432 $ 101,367
Total net sales $ 83,237 $ 89,213