Shareholders' Equity (Details) - $ / shares							12 Months Ended
	Jan. 25, 2018	Oct. 19, 2017	Jul. 27, 2017	Apr. 27, 2017	Jan. 26, 2017	Apr. 02, 2013	Dec. 31, 2017
Class of Stock [Line Items]
Declared quarterly cash dividend		$ 0.22	$ 0.22	$ 0.22	$ 0.22
Subsequent Event [Member]
Class of Stock [Line Items]
Declared quarterly cash dividend	$ 0.22
Preferred Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues						8,782	0