Stockholders' Equity (Dividends) (Details) - $ / shares		1 Months Ended												3 Months Ended								12 Months Ended
	Mar. 06, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Mar. 31, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)		$ 0.1600	$ 0.1600	$ 0.1600	$ 0.1600	$ 0.1350	$ 0.1350	$ 0.1350	$ 0.1350	$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1175	$ 0.1600	$ 0.1600	$ 0.1600	$ 0.1600	$ 0.1350	$ 0.1350	$ 0.1350	$ 0.1350	$ 0.64	$ 0.54	$ 0.470
Subsequent Event
Class of Stock [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.2250