Stockholders' Equity Dividends Declared (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Feb. 20, 2014
Dividends [Abstract]
Dividends Payable, Amount Per Share					$ 0.34
Common Stock, Dividends, Per Share, Declared		$ 1.34	$ 1.25	$ 1.12
Dividends Payable, Date Declared	Feb. 20, 2014
Dividends Payable, Date to be Paid	Apr. 10, 2014
Dividends Payable, Date of Record	Mar. 20, 2014