Stockholders' Equity (Dividends) (Details) - $ / shares		1 Months Ended											3 Months Ended								12 Months Ended
	Mar. 01, 2016	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2013	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May. 02, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May. 03, 2014	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)		$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.085	$ 0.085	$ 0.085	$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1000	$ 0.1000	$ 0.1000	$ 0.1000	$ 0.470	$ 0.400	$ 0.255
Subsequent Event [Member]
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.135