Note 1 - Summary of Significant Accounting Policies (Details) - Summary of Earnings Per Share, Basic, Two Class Method - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 29, 2015	May. 30, 2015	Feb. 28, 2015	Nov. 29, 2014	Aug. 30, 2014	May. 31, 2014	Mar. 01, 2014	Nov. 30, 2013	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to shareholders									$ 124,299	$ 119,925	$ 116,685
Weighted average number of shares for Basic:
Weignted average number of shares for Basic (in Shares)									20,098	20,040	19,986
Common Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to shareholders	$ 23,011	$ 25,817	$ 20,182	$ 29,649	$ 22,876	$ 24,493	$ 20,267	$ 27,208	$ 98,665	$ 94,849	$ 91,916
Weighted average number of shares for Basic:
Weignted average number of shares for Basic (in Shares)									15,182	15,080	14,975
Earnings per share for Basic:
Earnings per share for Basic (in Dollars per share)	$ 1.51	$ 1.70	$ 1.33	$ 1.96	$ 1.51	$ 1.62	$ 1.34	$ 1.81	$ 6.50	$ 6.29	$ 6.14
Common Class B [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to shareholders	$ 5,803	$ 6,483	$ 5,041	$ 7,434	$ 5,742	$ 6,127	$ 5,041	$ 6,798	$ 24,761	$ 23,705	$ 22,913
Weighted average number of shares for Basic:
Weignted average number of shares for Basic (in Shares)									4,763	4,711	4,666
Earnings per share for Basic:
Earnings per share for Basic (in Dollars per share)	$ 1.21	$ 1.36	$ 1.06	$ 1.57	$ 1.21	$ 1.30	$ 1.08	$ 1.45	$ 5.20	$ 5.03	$ 4.91
Unvested Participating Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to shareholders									$ 873	$ 1,371	$ 1,856
Weighted average number of shares for Basic:
Weignted average number of shares for Basic (in Shares)									153	249	345