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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, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Jan. 31, 2017
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 843,058 $ 878,607 $ 843,058 $ 878,607 $ 867,786
Total net sales 872,931 890,568 1,634,121 1,653,145  
Domestic Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 744,388 766,189 744,388 766,189 766,419
Total net sales 764,846 778,487 1,442,799 1,451,850  
Foreign Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 98,670 112,418 98,670 112,418 $ 101,367
Total net sales $ 108,085 $ 112,081 $ 191,322 $ 201,295