Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Component of Other Income, Nonoperating [Line Items]
Gain on sale of fixed assets	$ 826	$ 2,220	$ 2,407	$ 5,139
Miscellaneous income, net	(77)	137	(44)	178
Write-off of deferred financing costs	(321)	0	(321)	0
Total other income, net	428	2,357	2,042	5,317
Prior Credit Agreement Which Has Been Terminated or Replaced | Revolving Credit Facility
Component of Other Income, Nonoperating [Line Items]
Write-off of deferred financing costs			$ (321)