Fair Value Measurements (Impairment of Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 26, 2012	Oct. 28, 2011
BEF Foods [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 87
Restaurants [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of Long-Lived Assets Held-for-use	1,227	2,806
Underperforming Location [Member] | Restaurants [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of Long-Lived Assets Held-for-use		600
Non Operating Restaurant [Member] | Restaurants [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 1,227	$ 2,206