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Note 1 - Summary of Significant Accounting Policies (Details) - Summary of Earnings Per Share, Diluted, 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, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Earnings to common shareholders                 $ 124,299 $ 119,925 $ 116,685
Add: Undistributed earnings allocated to unvested participating shares                 853 1,339 1,810
Less: Undistributed earnings reallocated to unvested participating shares                 (807) (1,267) (1,712)
Diluted EPS – Common Stock $ 28,821 $ 32,310 $ 25,235 $ 37,101 $ 28,631 $ 30,637 $ 25,326 $ 34,031 $ 123,472 $ 118,626 $ 114,927
Diluted EPS – Common Stock (in Shares) 20,142 20,118 20,065 20,008 20,007 19,977 19,924 19,891 20,079 19,939 19,789
Diluted EPS – Common Stock (in Dollars per share) $ 1.43 $ 1.61 $ 1.26 $ 1.85 $ 1.43 $ 1.53 $ 1.27 $ 1.71 $ 6.15 $ 5.95 $ 5.81
Add: effect of dilutive potential common shares                      
Share-Based Awards (in Shares)                 134 148 148
Common Class A [Member]                      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Earnings to common shareholders $ 23,011 $ 25,817 $ 20,182 $ 29,649 $ 22,876 $ 24,493 $ 20,267 $ 27,208 $ 98,665 $ 94,849 $ 91,916
Common shares (in Shares) 15,210 15,207 15,185 15,128 15,113 15,102 15,077 15,029 15,182 15,080 14,975
EPS (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, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Earnings to common shareholders $ 5,803 $ 6,483 $ 5,041 $ 7,434 $ 5,742 $ 6,127 $ 5,041 $ 6,798 $ 24,761 $ 23,705 $ 22,913
Common shares (in Shares) 4,795 4,773 4,741 4,741 4,741 4,722 4,687 4,693 4,763 4,711 4,666
EPS (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