Note 6. Net Income Per Share (Details) - Summary of Earnings Per Share Basic 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, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 28,722	$ 27,459	$ 86,124	$ 72,457
Weighted average number of shares for Basic:
Weighted average number of shares for Basic (in Shares)	19,999	19,936	19,982	19,907
Common Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	22,638	21,587	67,793	56,926
Weighted average number of shares for Basic:
Weighted average number of shares for Basic (in Shares)	14,993	14,905	14,960	14,872
Earnings per share for Basic:
Earnings per share for Basic (in Dollars per share)	$ 1.51	$ 1.45	$ 4.53	$ 3.83
Common Class B [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	5,647	5,381	16,880	14,214
Weighted average number of shares for Basic:
Weighted average number of shares for Basic (in Shares)	4,675	4,644	4,656	4,642
Earnings per share for Basic:
Earnings per share for Basic (in Dollars per share)	$ 1.21	$ 1.16	$ 3.63	$ 3.06
Unvested Participating Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 437	$ 491	$ 1,451	$ 1,317
Weighted average number of shares for Basic:
Weighted average number of shares for Basic (in Shares)	331	387	366	393