Summary of Significant Accounting Policies Summary Of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 530,689	$ 505,356
Less accumulated depreciation and amortization	(348,597)	(334,619)
Property, plant, and equipment, net	182,092	170,737
Office Equipment
Property, Plant and Equipment
Property, plant, and equipment, gross	351,982	334,817
Building
Property, Plant and Equipment
Property, plant, and equipment, gross	115,312	110,854
Land Improvements
Property, Plant and Equipment
Property, plant, and equipment, gross	21,489	21,650
Leasehold Improvements
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 41,906	$ 38,035