Note 7 - Summary of Earnings Per Share, Basic, 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:
Income allocated to – Basic	$ 28,539	$ 29,649
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	15,218	15,128
Income per share – Basic:
Income per share – Basic (in dollars per share)	$ 1.88	$ 1.96
Common Class B [Member]
Income allocated to – Basic:
Income allocated to – Basic	$ 7,193	$ 7,434
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	4,795	4,741
Income per share – Basic:
Income per share – Basic (in dollars per share)	$ 1.50	$ 1.57
Unvested Participating Shares [Member]
Income allocated to – Basic:
Income allocated to – Basic	$ 158	$ 330
Weighted average number of shares outstanding – Basic:
Weighted average number of shares for Basic (in shares)	95	192
Net income	$ 35,890	$ 37,413
Income allocated to – Basic	$ 35,890	$ 37,413
Weighted average number of shares for Basic (in shares)	20,108	20,061