Business and Summary of Accounting Policies Ranges of Useful Lives (Details)	12 Months Ended
	Jan. 31, 2015
Minimum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum | Computer Hardware And Software
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Maximum | Computer Hardware And Software
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years