Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 27, 2011
Class A Common Stock
Net Income (Loss) Available to Common Stockholders, Basic	$ 3,932	$ 4,128
Two Class Income Allocation Class B Conversion to Class A	1,776	2,435
Two Class Income Distribution Share Based Compensation	11	24
Net Income (Loss) Available to Common Stockholders, Diluted	5,719	6,587
Weighted Average Number of Shares Outstanding, Basic	7,549	7,017
Two Class Share Allocation Class B Conversion to Class A	5,913	6,373
Incremental Common Shares Attributable to Share-based Payment Arrangements	129	59
Weighted Average Number of Shares Outstanding, Diluted	13,591	13,449
Class B Common Stock
Net Income (Loss) Available to Common Stockholders, Basic	1,776	2,435
Two Class Income Distribution Share Based Compensation	(11)	(10)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 1,765	$ 2,425
Weighted Average Number of Shares Outstanding, Basic	5,913	6,373
Weighted Average Number of Shares Outstanding, Diluted	5,913	6,373