Capital Stock - Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Apr. 29, 2017	Jan. 28, 2017	Jan. 27, 2018	Jan. 25, 2020	Jan. 26, 2019	Jul. 29, 2017
Stockholders' Equity Note [Abstract]
Repurchase of common stock, shares	400,000	313,006	200,000			713,006
Total Consideration (In thousands)	$ 37,900	$ 25,000	$ 16,875	$ 0	$ 0	$ 62,909
Average Price Per Share (in dollars per share)	$ 94.77	$ 79.87	$ 84.38			$ 88.23