Segment and Geographic Information - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) Segment Location	Jul. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			2
Number of geographic locations | Location			2
Net sales	$ 157,816	$ 144,093	$ 304,365	$ 271,242
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	$ 91,000	$ 76,500	$ 168,900	$ 141,100
Geographic Concentration Risk | Europe | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	32.00%	32.10%	33.10%	32.30%
Geographic Concentration Risk | Americas (excluding the United States) | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	9.70%	11.20%	9.20%	11.00%
Geographic Concentration Risk | Middle East | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	9.00%	8.80%	9.10%	9.60%
Geographic Concentration Risk | Asia | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	6.60%	6.90%	7.10%	7.40%