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Segment and Geographic Information (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2016
USD ($)
Segment
Location
Jul. 31, 2015
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | Segment     2  
Number of geographic locations | Location     2  
Net sales $ 128,086 $ 145,569 $ 242,149 $ 266,030
Unallocated corporate expenses 10,000 9,500 18,700 16,600
Profits related to the company's supply chain operations 9,400 10,900 16,500 19,700
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Net sales $ 72,400 $ 76,700 $ 155,900 $ 158,200
Geographic Concentration Risk | Europe | Total net sales        
Segment Reporting Information [Line Items]        
International Operations Contribution 22.30% 19.80% 22.80% 19.90%
Geographic Concentration Risk | Middle East | Total net sales        
Segment Reporting Information [Line Items]        
International Operations Contribution 10.00% 7.70% 9.30% 7.60%
Geographic Concentration Risk | the Americas (excluding the United States) | Total net sales        
Segment Reporting Information [Line Items]        
International Operations Contribution 8.30% 11.90% 9.20% 11.60%
Geographic Concentration Risk | Asia | Total net sales        
Segment Reporting Information [Line Items]        
International Operations Contribution 7.20% 6.50% 6.30% 7.00%