Note 1 - Summary of Significant Accounting Policies (Details) - Summary of Earnings Per Share, Diluted, Two Class Method (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012	Aug. 27, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic	$ 116,685	$ 94,989	$ 76,486
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic	91,916	74,643	59,944
As reported - Basic (in Shares)	14,975	14,882	14,791
As reported - Basic (in Dollars per share)	$ 6.14	$ 5.02	$ 4.05
Effect pf dilutive potential common shares (in Shares)	148	91	83
Add: Undistributed earnings allocated to unvested participating shares	1,810	1,664	1,385
Less: Undistributed earnings reallocated to unvested participating shares	(1,712)	(1,579)	(1,315)
Diluted EPS – Common Stock	114,927	93,358	75,118
Diluted EPS – Common Stock (in Shares)	19,789	19,616	19,532
Diluted EPS – Common Stock (in Dollars per share)	$ 5.81	$ 4.76	$ 3.85
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - Basic	22,913	18,630	15,104
As reported - Basic (in Shares)	4,666	4,643	4,658
As reported - Basic (in Dollars per share)	$ 4.91	$ 4.01	$ 3.24
Effect pf dilutive potential common shares	$ 22,913	$ 18,630	$ 15,104
Effect pf dilutive potential common shares (in Shares)	4,666	4,643	4,658