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Segment and Geographic Information - Additional Information (Details)
12 Months Ended
Jan. 31, 2019
Segment
Location
Jan. 31, 2018
Jan. 31, 2017
Segment Reporting Information [Line Items]      
Number of operating segments | Segment 2    
Number of geographic locations | Location 2    
Geographic Concentration Risk | Europe | Total net sales      
Segment Reporting Information [Line Items]      
International Operations Contribution 31.60% 32.10% 23.10%
Geographic Concentration Risk | Americas (excluding the United States) | Total net sales      
Segment Reporting Information [Line Items]      
International Operations Contribution 8.80% 9.20% 8.90%
Geographic Concentration Risk | Middle East | Total net sales      
Segment Reporting Information [Line Items]      
International Operations Contribution 7.70% 7.70% 8.10%
Geographic Concentration Risk | Asia | Total net sales      
Segment Reporting Information [Line Items]      
International Operations Contribution 6.50% 5.10% 6.30%