Summary of Significant Accounting Policies Summary Of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 584,704	$ 530,689
Less accumulated depreciation and amortization	(374,024)	(348,597)
Property, plant, and equipment, net	210,680	182,092
Office Equipment
Property, Plant and Equipment
Property, plant, and equipment, gross	394,042	351,982
Building
Property, Plant and Equipment
Property, plant, and equipment, gross	117,240	115,312
Land Improvements
Property, Plant and Equipment
Property, plant, and equipment, gross	24,610	21,489
Leasehold Improvements
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 48,812	$ 41,906