Stockholders' Equity Stockholders' Equity -Dividends Declared (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Dividends [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.34	$ 0.32	$ 1.00	$ 0.93