Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 27, 2012
Guarantor Obligations [Line Items]
Proceeds received from legal settlement	$ 3,000
Total guarantee of lease agreement	928
Financial Standby Letter of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit	28,606
Third party lease guarantees [Member]
Guarantor Obligations [Line Items]
Remaining life of lease with guaranteed payments (in years)	1.7
Annual lease payments under operating lease agreement	361
Total guarantee of lease agreement	601
Indemnification agreement Logan's 2 [Member]
Guarantor Obligations [Line Items]
Remaining life of lease with guaranteed payments (in years)	8.2Y
Annual lease payments under operating lease agreement	$ 108