Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013	Jul. 01, 2015
Class of Stock [Line Items]
Number of Shares Repurchased	1,669,924	360,900	1,047,000
Average Price Per Share (in dollars per share)	$ 52.19	$ 27.71	$ 14.52
Total Consideration (Dollars in thousands)	$ 87,146	$ 9,999	$ 15,203
Shares Paid for Tax Withholding for Share Based Compensation	145,395	136,604	47,277
Value of Shares Paid for Tax Withholding for Share Based Compensation	$ 4,700	$ 3,800	$ 900
Common Stock
Class of Stock [Line Items]
Remaining authorized repurchase amount	$ 10,000
Common stock authorized repurchase amount				$ 40,000