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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 | 12 Months Ended
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Aug. 31, 2013 | Aug. 25, 2012 | Aug. 27, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income available to shareholders (in Dollars) | $ 116,685 | $ 94,989 | $ 76,486
Common Class A [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income available to shareholders (in Dollars) | 91,916 | 74,643 | 59,944
Allocation of net income for Basic: |  |  |
Allocation of net income for Basic: | $ 91,916 | $ 74,643 | $ 59,944
Weighted average number of shares for Basic: |  |  |
Weighted average number of shares for Basic (in Shares) | 14,975 | 14,882 | 14,791
Earnings per share for Basic: |  |  |
Earnings per share for Basic | $ 6.14 | $ 5.02 | $ 4.05
Common Class B [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income available to shareholders (in Dollars) | 22,913 | 18,630 | 15,104
Allocation of net income for Basic: |  |  |
Allocation of net income for Basic: | $ 22,913 | $ 18,630 | $ 15,104
Weighted average number of shares for Basic: |  |  |
Weighted average number of shares for Basic (in Shares) | 4,666 | 4,643 | 4,658
Earnings per share for Basic: |  |  |
Earnings per share for Basic | $ 4.91 | $ 4.01 | $ 3.24
Unvested Participating Shares [Member] |  |  |
Allocation of net income for Basic: |  |  |
Allocation of net income for Basic: | $ 1,856 | $ 1,716 | $ 1,438
Weighted average number of shares for Basic: |  |  |
Weighted average number of shares for Basic (in Shares) | 345 | 391 | 405
Total Allocation Of Net Income Basic [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income available to shareholders (in Dollars) | $ 116,685 | $ 94,989 | $ 76,486
Total Weighted Average Number Of Shares Basic [Member] |  |  |
Weighted average number of shares for Basic: |  |  |
Weighted average number of shares for Basic (in Shares) | 19,986 | 19,916 | 19,854

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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