Summary of Significant Accounting Policies Summary Of Property, Plant and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Property, Plant and Equipment
Computer equipment and furniture	$ 319,698	$ 308,229
Buildings and building equipment	101,073	97,989
Land and improvements	21,321	21,345
Leasehold Improvements	38,900	35,753
Property, plant, and equipment, gross	480,992	463,316
Less accumulated depreciation and amortization	(320,827)	(300,914)
Property, plant, and equipment, net	$ 160,165	$ 162,402