Common Stock Dividends (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Jan. 31, 2012
Dividends, Common Stock [Abstract]
Annual dividend approved by Board of Directors	$ 0.00	$ 0.00	$ 1.59	$ 1.46
Percent increase over fiscal 2012 dividend	9.00%		9.00%
Dividend paid					$ 1.46
Common Stock, Quarterly Dividends, Per Share, Declared			$ 0.3975