Capital Stock (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Mar. 15, 2012	Oct. 27, 2012	Oct. 29, 2011	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Stockholders' Equity Note [Abstract]
Common stock authorized repurchase amount	$ 40,000,000
Number of Shares Repurchased		1,047,000		597,700	5,389,500	475,602
Total Consideration (Dollars in thousands)		15,203,000	0	12,960,000	64,548,000	4,489,000
Average Price Per Share (in dollars per share)		$ 14.52		$ 21.68	$ 11.98	$ 9.44
Remaining authorized repurchase amount		$ 22,800,000