Segment Information (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014 Segment Location	Jul. 31, 2013
Segment Reporting Information [Line Items]
Number of operating segments			2
Number of geographic locations			2
Net sales	$ 143,591	$ 138,301	$ 264,512	$ 248,311
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	$ 85,600	$ 88,500	$ 150,300	$ 154,400
Europe | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	18.90%	18.10%	18.90%	18.30%
the Americas (excluding the United States) | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	11.60%	11.70%	11.40%	11.50%
Middle East | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	8.10%	8.80%	8.50%	8.90%
Asia | Total net sales
Segment Reporting Information [Line Items]
International Operations Contribution	7.00%	8.40%	8.10%	8.30%