Stockholders' Equity - Cash Dividends Declared and Paid (Details) - $ / shares	3 Months Ended
	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	Apr. 25, 2015	Jan. 24, 2015	Oct. 25, 2014	Jul. 26, 2014	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013
Equity [Abstract]
Cash dividend paid (in usd per share)	$ 0.24	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.16	$ 0.16	$ 0.16