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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, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Segment Reporting Information [Line Items]          
Total property and equipment, net $ 807,084 $ 843,058 $ 807,084 $ 843,058 $ 813,768
Total net sales 992,454 872,931 1,848,142 1,634,121  
Domestic Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 730,024 744,388 730,024 744,388 720,890
Total net sales 865,517 764,846 1,612,668 1,442,799  
Foreign Operations          
Segment Reporting Information [Line Items]          
Total property and equipment, net 77,060 98,670 77,060 98,670 $ 92,878
Total net sales $ 126,937 $ 108,085 $ 235,474 $ 191,322