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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 31, 2013
Accounting Policies [Abstract] |
Estimated Useful Lives Of Property Plant And Equipment [Table Text Block] |
Buildings (in years) | 30 | - | 40
Building components (in years) | 10 | - | 20
Leasehold improvements | Shorter of useful life or term of lease
Machinery and equipment (in years) | 3 | - | 10
Motor vehicles (in years) | 3 | - | 5
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Fiscal year ended August |  | 2013 |  | 2012 |  | 2011
Risk-free interest rate |  |  | 1.24 | % |  |  | 1.54 | % |  |  | 1.98 | %
Expected dividend yield |  |  | 0.41 | % |  |  | 0.56 | % |  |  | 0.60 | %
Expected life in years |  |  | 7.42 |  |  |  | 7.39 |  |  |  | 7.32 |
Expected volatility |  |  | 33.4 | % |  |  | 33.8 | % |  |  | 34.8 | %
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] |
Year ended |  | August 31, 2013 |  |  | August 25, 2012 |  |  | August 27, 2011 |
Net income available to shareholders |  | $ | 116,685 |  |  | $ | 94,989 |  |  | $ | 76,486 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 91,916 |  |  | $ | 74,643 |  |  | $ | 59,944 |
Class B Common Stock |  |  | 22,913 |  |  |  | 18,630 |  |  |  | 15,104 |
Unvested participating shares |  |  | 1,856 |  |  |  | 1,716 |  |  |  | 1,438 |
|  | $ | 116,685 |  |  | $ | 94,989 |  |  | $ | 76,486 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 14,975 |  |  |  | 14,882 |  |  |  | 14,791 |
Class B Common Stock |  |  | 4,666 |  |  |  | 4,643 |  |  |  | 4,658 |
Unvested participating shares |  |  | 345 |  |  |  | 391 |  |  |  | 405 |
|  |  | 19,986 |  |  |  | 19,916 |  |  |  | 19,854 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 6.14 |  |  | $ | 5.02 |  |  | $ | 4.05 |
Class B Common Stock |  | $ | 4.91 |  |  | $ | 4.01 |  |  | $ | 3.24 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | Year Ended August 31, 2013 |  |  | Year Ended August 25, 2012 |  |  | Year Ended August 27, 2011 |
|  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 91,916 |  |  |  | 14,975 |  |  | $ | 6.14 |  |  | $ | 74,643 |  |  |  | 14,882 |  |  | $ | 5.02 |  |  | $ | 59,944 |  |  |  | 14,791 |  |  | $ | 4.05 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Awards |  |  | — |  |  |  | 148 |  |  |  |  |  |  |  | — |  |  |  | 91 |  |  |  |  |  |  |  | — |  |  |  | 83 |  |  |  |  |
Class B Common Stock |  |  | 22,913 |  |  |  | 4,666 |  |  |  |  |  |  |  | 18,630 |  |  |  | 4,643 |  |  |  |  |  |  |  | 15,104 |  |  |  | 4,658 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 1,810 |  |  |  | — |  |  |  |  |  |  |  | 1,664 |  |  |  | — |  |  |  |  |  |  |  | 1,385 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (1,712 | ) |  |  | — |  |  |  |  |  |  |  | (1,579 | ) |  |  | — |  |  |  |  |  |  |  | (1,315 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 114,927 |  |  |  | 19,789 |  |  | $ | 5.81 |  |  | $ | 93,358 |  |  |  | 19,616 |  |  | $ | 4.76 |  |  | $ | 75,118 |  |  |  | 19,532 |  |  | $ | 3.85 |

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