Capital Stock (Details) (USD $)	12 Months Ended			0 Months Ended			12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011	Mar. 15, 2012 Common Stock	Sep. 12, 2013 Common Stock Subsequent Event	Aug. 27, 2013 Common Stock Subsequent Event	Jul. 27, 2013 Common Stock Subsequent Event
Class of Stock [Line Items]
Remaining authorized repurchase amount							$ 22,800,000
Common stock authorized repurchase amount				40,000,000	40,000,000	40,000,000
Repurchase of common stock	1,047,000	597,700	5,389,500
Total Consideration (Dollars in thousands)	$ 15,203,000	$ 12,960,000	$ 64,548,000
Average Price Per Share (in dollars per share)	$ 14.52	$ 21.68	$ 11.98