Note 7 - Summary of Earnings Per Share, Diluted, Two Class Method (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended
	May 28, 2016	May 30, 2015	May 28, 2016	May 30, 2015
Common Class A [Member]
Income allocated to – Basic	$ 23,939,000	$ 25,817,000	$ 71,172,000	$ 75,650,000
Weighted average number of shares outstanding – Basic (in shares)	15,253	15,207	15,238	15,173
Income per share – Basic (in dollars per share)	$ 1.57	$ 1.70	$ 4.67	$ 4.99
Dilutive potential common shares	$ 0	$ 0	$ 0	$ 0
Dilutive potential common shares (in shares)	103	138	98	132
Dilutive potential common shares	$ 0	$ 0	$ 0	$ 0
Income allocated to – Diluted	$ 30,007,000	$ 32,310,000	$ 89,149,000	$ 94,644,000
Weighted average number of shares outstanding – Diluted (in shares)	20,183	20,118	20,141	20,057
Income per share – Diluted (in dollars per share)	$ 1.49	$ 1.61	$ 4.43	$ 4.72
Common Class B [Member]
Income allocated to – Basic	$ 6,061,000	$ 6,483,000	$ 17,956,000	$ 18,954,000
Weighted average number of shares outstanding – Basic (in shares)	4,827	4,773	4,805	4,752
Income per share – Basic (in dollars per share)	$ 1.26	$ 1.36	$ 3.74	$ 3.99
Dilutive potential common shares	$ 6,061,000	$ 6,483,000	$ 17,956,000	$ 18,954,000
Dilutive potential common shares (in shares)	4,827	4,773	4,805	4,752
Dilutive potential common shares	$ 6,061,000	$ 6,483,000	$ 17,956,000	$ 18,954,000
Income allocated to – Basic	30,144,000	32,499,000	89,532,000	95,358,000
Add: Undistributed earnings allocated to unvested participating shares	141,000	194,000	395,000	737,000
Less: Undistributed earnings reallocated to unvested participating shares	(134,000)	(184,000)	(374,000)	(697,000)
Income allocated to – Diluted	$ 30,007,000	$ 32,310,000	$ 89,149,000	$ 94,644,000
Weighted average number of shares outstanding – Diluted (in shares)	20,183	20,118	20,141	20,057
Income per share – Diluted (in dollars per share)	$ 1.49	$ 1.61	$ 4.43	$ 4.72