Share Repurchases (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 28, 2017	Jul. 29, 2016	Jul. 31, 2015
Share Repurchases [Abstract]
Maximum aggregate purchase price	$ 25,000	$ 25,000	$ 25,000
Shares of common stock repurchased (in shares)	0	100,000	0
Cost of shares repurchased	$ 0	$ 14,653	$ 0