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Note 6 - Net Income Per Share (Tables) | 3 Months Ended
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Nov. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended |
|  | November 30, 2013 |  |  | November 24, 2012 |
Net income available to shareholders |  | $ | 34,462 |  |  | $ | 30,760 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |
Common Stock |  | $ | 27,208 |  |  | $ | 24,191 |
Class B Common Stock |  |  | 6,798 |  |  |  | 6,025 |
Unvested participating shares |  |  | 456 |  |  |  | 544 |
|  | $ | 34,462 |  |  | $ | 30,760 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |
Common Stock |  |  | 15,029 |  |  |  | 14,925 |
Class B Common Stock |  |  | 4,693 |  |  |  | 4,647 |
Unvested participating shares |  |  | 288 |  |  |  | 383 |
|  |  | 20,010 |  |  |  | 19,955 |
Earnings per share for Basic: |  |  |  |  |  |  |  |
Common Stock |  | $ | 1.81 |  |  | $ | 1.62 |
Class B Common Stock |  | $ | 1.45 |  |  | $ | 1.30 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended November 30, 2013 |  |  | Thirteen weeks ended November 24, 2012 |
|  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 27,208 |  |  |  | 15,029 |  |  | $ | 1.81 |  |  | $ | 24,191 |  |  |  | 14,925 |  |  | $ | 1.62 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Awards |  |  | — |  |  |  | 169 |  |  |  |  |  |  |  | — |  |  |  | 121 |  |  |  |  |
Class B Common Stock |  |  | 6,798 |  |  |  | 4,693 |  |  |  |  |  |  |  | 6,025 |  |  |  | 4,647 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 447 |  |  |  | — |  |  |  |  |  |  |  | 531 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (422 | ) |  |  | — |  |  |  |  |  |  |  | (503 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  |  | 34,031 |  |  |  | 19,891 |  |  | $ | 1.71 |  |  |  | 30,244 |  |  |  | 19,693 |  |  | $ | 1.54 |

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