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Note 6 - Net Income Per Share (Tables) | 9 Months Ended
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May 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended |  |  | Thirty-nine weeks ended |
|  | May 31, 2014 |  |  | May 25, 2013 |  |  | May 31, 2014 |  |  | May 25, 2013 |
Net income |  | $ | 30,944 |  |  | $ | 28,722 |  |  | $ | 91,053 |  |  | $ | 86,124 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 24,493 |  |  | $ | 22,638 |  |  | $ | 71,971 |  |  | $ | 67,793 |
Class B Common Stock |  |  | 6,127 |  |  |  | 5,647 |  |  |  | 17,962 |  |  |  | 16,880 |
Unvested participating shares |  |  | 324 |  |  |  | 437 |  |  |  | 1,120 |  |  |  | 1,451 |
|  | $ | 30,944 |  |  | $ | 28,722 |  |  | $ | 91,053 |  |  | $ | 86,124 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 15,102 |  |  |  | 14,993 |  |  |  | 15,069 |  |  |  | 14,960 |
Class B Common Stock |  |  | 4,722 |  |  |  | 4,675 |  |  |  | 4,701 |  |  |  | 4,656 |
Unvested participating shares |  |  | 229 |  |  |  | 331 |  |  |  | 268 |  |  |  | 366 |
|  |  | 20,053 |  |  |  | 19,999 |  |  |  | 20,038 |  |  |  | 19,982 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 1.62 |  |  | $ | 1.51 |  |  | $ | 4.78 |  |  | $ | 4.53 |
Class B Common Stock |  | $ | 1.30 |  |  | $ | 1.21 |  |  | $ | 3.82 |  |  | $ | 3.63 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | Thirteen weeks ended May 31, 2014 |  |  | Thirty-nine weeks ended May 31, 2014 |
|  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 24,493 |  |  |  | 15,102 |  |  | $ | 1.62 |  |  | $ | 71,971 |  |  |  | 15,069 |  |  | $ | 4.78 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  | — |  |  |  | 153 |  |  |  |  |  |  |  | — |  |  |  | 151 |  |  |  |  |
Class B Common Stock |  |  | 6,127 |  |  |  | 4,722 |  |  |  |  |  |  |  | 17,962 |  |  |  | 4,701 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 317 |  |  |  | — |  |  |  |  |  |  |  | 1,095 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (300 | ) |  |  | — |  |  |  |  |  |  |  | (1,036 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 30,637 |  |  |  | 19,977 |  |  | $ | 1.53 |  |  | $ | 89,992 |  |  |  | 19,921 |  |  | $ | 4.52 |
|  | Thirteen weeks ended May 25, 2013 |  |  | Thirty-nine weeks ended May 25, 2013 |
|  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 22,638 |  |  |  | 14,993 |  |  | $ | 1.51 |  |  | $ | 67,793 |  |  |  | 14,960 |  |  | $ | 4.53 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  | — |  |  |  | 152 |  |  |  |  |  |  |  | — |  |  |  | 135 |  |  |  |  |
Class B Common Stock |  |  | 5,647 |  |  |  | 4,675 |  |  |  |  |  |  |  | 16,880 |  |  |  | 4,656 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 426 |  |  |  | — |  |  |  |  |  |  |  | 1,415 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (404 | ) |  |  | — |  |  |  |  |  |  |  | (1,341 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 28,307 |  |  |  | 19,820 |  |  | $ | 1.43 |  |  | $ | 84,747 |  |  |  | 19,751 |  |  | $ | 4.29 |

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