Note 7 - Summary of Earnings Per Share, Basic, 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:
Income allocated to – Basic	$ 23,939,000	$ 25,817,000	$ 71,172,000	$ 75,650,000
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	15,253	15,207	15,238	15,173
Income per share – Basic:
Income per share – Basic (in dollars per share)	$ 1.57	$ 1.70	$ 4.67	$ 4.99
Common Class B [Member]
Income allocated to – Basic:
Income allocated to – Basic	$ 6,061,000	$ 6,483,000	$ 17,956,000	$ 18,954,000
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	4,827	4,773	4,805	4,752
Income per share – Basic:
Income per share – Basic (in dollars per share)	$ 1.26	$ 1.36	$ 3.74	$ 3.99
Unvested Participating Shares [Member]
Income allocated to – Basic:
Income allocated to – Basic	$ 144,000	$ 199,000	$ 404,000	$ 754,000
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	97	134	96	173
Net income	$ 30,144,000	$ 32,499,000	$ 89,532,000	$ 95,358,000
Income allocated to – Basic	$ 30,144,000	$ 32,499,000	$ 89,532,000	$ 95,358,000
Weighted average number of shares for Basic (in shares)	20,177	20,114	20,139	20,098