Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 0.00	$ 0.00	$ 1.59	$ 1.46