Stock Compensation Plans Valuation Assumptions (Details)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Dividend yield	1.90%	1.30%	1.20%
Expected Volatility	28.10%	30.20%	39.60%
Risk Free Interest Rate	1.50%	1.50%	1.40%
Expected Term in years	5 years	5 years	5 years