Note 7 - Summary of Earnings Per Share, Diluted, Two Class Method (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 28, 2015	Nov. 29, 2014
Common Class A [Member]
Income allocated to – Basic	$ 28,539	$ 29,649
Weighted average number of shares outstanding – Basic (in shares)	15,218	15,128
Income per share – Basic (in dollars per share)	$ 1.88	$ 1.96
Dilutive potential common shares (in shares)	119	139
Income allocated to – Diluted	$ 35,741	$ 37,101
Weighted average number of shares outstanding – Diluted (in shares)	20,132	20,008
Income per share – Diluted (in dollars per share)	$ 1.78	$ 1.85
Common Class B [Member]
Income allocated to – Basic	$ 7,193	$ 7,434
Weighted average number of shares outstanding – Basic (in shares)	4,795	4,741
Income per share – Basic (in dollars per share)	$ 1.50	$ 1.57
Dilutive potential common shares (in shares)	4,795	4,741
Dilutive potential common shares	$ 7,193	$ 7,434
Income allocated to – Basic	35,890	37,413
Add: Undistributed earnings allocated to unvested participating shares	154	323
Less: Undistributed earnings reallocated to unvested participating shares	(145)	(305)
Income allocated to – Diluted	$ 35,741	$ 37,101
Weighted average number of shares outstanding – Diluted (in shares)	20,132	20,008
Income per share – Diluted (in dollars per share)	$ 1.78	$ 1.85