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Note 6 - Net Income Per Share (Tables) | 6 Months Ended
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Mar. 01, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended |  |  | Twenty-six weeks ended |
|  | March 1, 2014 |  |  | February 23, 2013 |  |  | March 1, 2014 |  |  | February 23, 2013 |
Net income |  | $ | 25,647 |  |  | $ | 26,642 |  |  | $ | 60,109 |  |  | $ | 57,402 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 20,267 |  |  | $ | 20,963 |  |  | $ | 47,479 |  |  | $ | 45,155 |
Class B Common Stock |  |  | 5,041 |  |  |  | 5,209 |  |  |  | 11,836 |  |  |  | 11,233 |
Unvested participating shares |  |  | 339 |  |  |  | 470 |  |  |  | 794 |  |  |  | 1,014 |
|  | $ | 25,647 |  |  | $ | 26,642 |  |  | $ | 60,109 |  |  | $ | 57,402 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 15,077 |  |  |  | 14,962 |  |  |  | 15,053 |  |  |  | 14,943 |
Class B Common Stock |  |  | 4,687 |  |  |  | 4,647 |  |  |  | 4,690 |  |  |  | 4,647 |
Unvested participating shares |  |  | 288 |  |  |  | 383 |  |  |  | 288 |  |  |  | 383 |
|  |  | 20,052 |  |  |  | 19,992 |  |  |  | 20,031 |  |  |  | 19,973 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 1.34 |  |  | $ | 1.40 |  |  | $ | 3.15 |  |  | $ | 3.02 |
Class B Common Stock |  | $ | 1.08 |  |  | $ | 1.12 |  |  | $ | 2.52 |  |  | $ | 2.42 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended March 1, 2014 |  |  | Twenty-six weeks ended March 1, 2014 |
|  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 20,267 |  |  |  | 15,077 |  |  | $ | 1.34 |  |  | $ | 47,479 |  |  |  | 15,053 |  |  | $ | 3.15 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  | — |  |  |  | 160 |  |  |  |  |  |  |  | — |  |  |  | 154 |  |  |  |  |
Class B Common Stock |  |  | 5,041 |  |  |  | 4,687 |  |  |  |  |  |  |  | 11,836 |  |  |  | 4,690 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 329 |  |  |  | — |  |  |  |  |  |  |  | 776 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (311 | ) |  |  | — |  |  |  |  |  |  |  | (734 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 25,326 |  |  |  | 19,924 |  |  | $ | 1.27 |  |  | $ | 59,357 |  |  |  | 19,897 |  |  | $ | 2.98 |
|  | Thirteen weeks ended February 23, 2013 |  |  | Twenty-six weeks ended February 23, 2013 |
|  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 20,963 |  |  |  | 14,962 |  |  | $ | 1.40 |  |  | $ | 45,155 |  |  |  | 14,943 |  |  | $ | 3.02 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  | — |  |  |  | 138 |  |  |  |  |  |  |  | — |  |  |  | 124 |  |  |  |  |
Class B Common Stock |  |  | 5,209 |  |  |  | 4,647 |  |  |  |  |  |  |  | 11,233 |  |  |  | 4,647 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 457 |  |  |  | — |  |  |  |  |  |  |  | 989 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (433 | ) |  |  | — |  |  |  |  |  |  |  | (937 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 26,196 |  |  |  | 19,747 |  |  | $ | 1.33 |  |  | $ | 56,440 |  |  |  | 19,714 |  |  | $ | 2.86 |

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