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Note 6 - Net Income Per Share (Tables) | 3 Months Ended
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Nov. 29, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended |
|  | November 29, |  |  | November 30, |
|  | 2014 |  |  | 2013 |
Net income available to shareholders |  | $ | 37,413 |  |  | $ | 34,462 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |
Common Stock |  | $ | 29,649 |  |  | $ | 27,208 |
Class B Common Stock |  |  | 7,434 |  |  |  | 6,798 |
Unvested participating shares |  |  | 330 |  |  |  | 456 |
|  | $ | 37,413 |  |  | $ | 34,462 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |
Common Stock |  |  | 15,128 |  |  |  | 15,029 |
Class B Common Stock |  |  | 4,741 |  |  |  | 4,693 |
Unvested participating shares |  |  | 192 |  |  |  | 288 |
|  |  | 20,061 |  |  |  | 20,010 |
Earnings per share for Basic: |  |  |  |  |  |  |  |
Common Stock |  | $ | 1.96 |  |  | $ | 1.81 |
Class B Common Stock |  | $ | 1.57 |  |  | $ | 1.45 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended November 29, 2014 |  |  | Thirteen weeks ended November 30, 2013 |
|  | Earnings |  |  |  |  |  |  |  |  |  |  | Earnings |  |  |  |  |  |  |  |  |
|  | to Common |  |  | Common |  |  |  |  |  |  | to Common |  |  | Common |  |  |  |  |
|  | shareholders |  |  | Shares |  |  | EPS |  |  | shareholders |  |  | Shares |  |  | EPS |
As reported - Basic |  | $ | 29,649 |  |  |  | 15,128 |  |  | $ | 1.96 |  |  | $ | 27,208 |  |  |  | 15,029 |  |  | $ | 1.81 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Awards |  |  | — |  |  |  | 139 |  |  |  |  |  |  |  | — |  |  |  | 169 |  |  |  |  |
Class B Common Stock |  |  | 7,434 |  |  |  | 4,741 |  |  |  |  |  |  |  | 6,798 |  |  |  | 4,693 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 323 |  |  |  | — |  |  |  |  |  |  |  | 447 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (305 | ) |  |  | — |  |  |  |  |  |  |  | (422 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 37,101 |  |  |  | 20,008 |  |  | $ | 1.85 |  |  | $ | 34,031 |  |  |  | 19,891 |  |  | $ | 1.71 |

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