Segment Reporting Total Property, Plant, and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Property, plant, and equipment, net:
Property, plant, and equipment, net	$ 170,737	$ 160,165
United States
Property, plant, and equipment, net:
Property, plant, and equipment, net	127,631	116,954
Europe
Property, plant, and equipment, net:
Property, plant, and equipment, net	31,751	34,800
Japan
Property, plant, and equipment, net:
Property, plant, and equipment, net	882	637
Asia
Property, plant, and equipment, net:
Property, plant, and equipment, net	10,295	7,633
Americas [Member]
Property, plant, and equipment, net:
Property, plant, and equipment, net	$ 178	$ 141