Consolidated Statement Of Shareholders' Equity (Parenthetical) - $ / shares		3 Months Ended		6 Months Ended
	Feb. 19, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 1.96	$ 0.00	$ 0.00	$ 1.96	$ 1.92