Note 6. Net Income Per Share (Details) - Summary of Earnings Per Share Diluted Two Class Method (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 25, 2013	May 26, 2012	May 25, 2013	May 26, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic (in Shares)	19,999	19,936	19,982	19,907
Add: Undistributed earnings allocated to unvested participating shares	$ 426	$ 478	$ 1,415	$ 1,279
Less: Undistributed earnings reallocated to unvested participating shares	(404)	(453)	(1,341)	(1,214)
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic	22,638	21,587	67,793	56,926
As reported - Basic (in Shares)	14,993	14,905	14,960	14,872
As reported - Basic (in Dollars per share)	$ 1.51	$ 1.45	$ 4.53	$ 3.83
Effect of dilutive potential common shares (in Shares)	152	97	135	86
Diluted EPS – Common Stock	28,307	26,993	84,747	71,205
Diluted EPS – Common Stock (in Shares)	19,820	19,646	19,751	19,600
Diluted EPS – Common Stock (in Dollars per share)	$ 1.43	$ 1.37	$ 4.29	$ 3.63
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic	5,647	5,381	16,880	14,214
As reported - Basic (in Shares)	4,675	4,644	4,656	4,642
As reported - Basic (in Dollars per share)	$ 1.21	$ 1.16	$ 3.63	$ 3.06
Effect of dilutive potential common shares	$ 5,647	$ 5,381	$ 16,880	$ 14,214
Effect of dilutive potential common shares (in Shares)	4,675	4,644	4,656	4,642