Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Payables and Accruals [Abstract]
Accrued payroll and related taxes	$ 18,882	$ 19,248
Accrued employee benefit and incentive plan costs	4,606	12,488
Accrued construction costs	11,990	11,515
Other current liabilities	12,164	7,675
Total other accrued liabilities	$ 47,642	$ 50,926