Impairment and Store Dispositions, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 27, 2012	Apr. 29, 2011
Impairment and Store Dispositions, Net [Abstract]
Impairment	$ 0	$ 2,175	$ 0	$ 2,175
Gains on disposition of stores	0	(4,133)	0	(4,133)
Store closing costs	0	0	0	84
Total	0	(1,958)	0	(1,874)
Impairment charges incurred during the period		$ 2,175
Number of stores closed during the period		2