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Note 1 - Summary of Significant Accounting Policies (Details) - Summary of Earnings Per Share, Basic, Two Class Method (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Aug. 30, 2014 | May 31, 2014 | Mar. 01, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 25, 2013 | Feb. 23, 2013 | Nov. 24, 2012 | Aug. 30, 2014 | Aug. 31, 2013 | Aug. 25, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to shareholders |  |  |  |  |  |  |  |  | $ 119,925 | $ 116,685 | $ 94,989
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |
Weignted average number of shares for Basic (in Shares) |  |  |  |  |  |  |  |  | 20,040 | 19,986 | 19,916
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to shareholders | 22,876 | 24,493 | 20,267 | 27,208 | 24,123 | 22,638 | 20,963 | 24,191 | 94,849 | 91,916 | 74,643
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |
Weignted average number of shares for Basic (in Shares) |  |  |  |  |  |  |  |  | 15,080 | 14,975 | 14,882
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |
Earnings per share for Basic (in Dollars per share) | $ 1.51 | $ 1.62 | $ 1.34 | $ 1.81 | $ 1.61 | $ 1.51 | $ 1.40 | $ 1.62 | $ 6.29 | $ 6.14 | $ 5.02
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to shareholders | 5,742 | 6,127 | 5,041 | 6,798 | 6,033 | 5,647 | 5,209 | 6,025 | 23,705 | 22,913 | 18,630
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |
Weignted average number of shares for Basic (in Shares) |  |  |  |  |  |  |  |  | 4,711 | 4,666 | 4,643
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |
Earnings per share for Basic (in Dollars per share) | $ 1.21 | $ 1.30 | $ 1.08 | $ 1.45 | $ 1.29 | $ 1.21 | $ 1.12 | $ 1.30 | $ 5.03 | $ 4.91 | $ 4.01
Unvested Participating Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to shareholders |  |  |  |  |  |  |  |  | $ 1,371 | $ 1,856 | $ 1,716
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |
Weignted average number of shares for Basic (in Shares) |  |  |  |  |  |  |  |  | 249 | 345 | 391

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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2646-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 + Details
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