Stockholders' Equity (Dividends) (Details) (USD $)	1 Months Ended												3 Months Ended								12 Months Ended			1 Months Ended
	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Jan. 31, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Jan. 31, 2012	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013	Mar. 30, 2015	Feb. 28, 2015
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.17	$ 0.17	$ 0.17	$ 0	$ 0.80	$ 0.51	$ 0.59
Subsequent Event [Member]
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)																									$ 0.235
Stock Split, Conversion Ratio																								2