Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (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
Class A Common Stock
Net Income (Loss) Available to Common Stockholders, Basic	$ 6,373	$ 5,613	$ 10,463	$ 9,741
Two Class Income Allocation Class B Conversion to Class A	2,503	3,299	4,123	5,734
Two Class Income Distribution Share Based Compensation		27		51
Net Income (Loss) Available to Common Stockholders, Diluted	8,876	8,939	14,586	15,526
Weighted Average Number of Shares Outstanding, Basic	8,396	7,030	7,972	7,023
Two Class Share Allocation Class B Conversion to Class A	5,086	6,362	5,500	6,367
Incremental Common Shares Attributable to Share-based Payment Arrangements	108	90	118	75
Weighted Average Number of Shares Outstanding, Diluted	13,590	13,482	13,590	13,465
Class B Common Stock
Net Income (Loss) Available to Common Stockholders, Basic	2,503	3,299	4,123	5,734
Two Class Income Distribution Share Based Compensation		(18)		(28)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 2,503	$ 3,281	$ 4,123	$ 5,706
Weighted Average Number of Shares Outstanding, Basic	5,086	6,362	5,500	6,367
Weighted Average Number of Shares Outstanding, Diluted	5,086	6,362	5,500	6,367