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Note 6. Net Income Per Share (Tables) | 9 Months Ended
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May 25, 2013
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 25, 2013 |  |  | May 26, 2012 |  |  | May 25, 2013 |  |  | May 26, 2012 |
Net income |  | $ | 28,722 |  |  | $ | 27,459 |  |  | $ | 86,124 |  |  | $ | 72,457 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 22,638 |  |  | $ | 21,587 |  |  | $ | 67,793 |  |  | $ | 56,926 |
Class B Common Stock |  |  | 5,647 |  |  |  | 5,381 |  |  |  | 16,880 |  |  |  | 14,214 |
Unvested participating shares |  |  | 437 |  |  |  | 491 |  |  |  | 1,451 |  |  |  | 1,317 |
|  | $ | 28,722 |  |  | $ | 27,459 |  |  | $ | 86,124 |  |  | $ | 72,457 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 14,993 |  |  |  | 14,905 |  |  |  | 14,960 |  |  |  | 14,872 |
Class B Common Stock |  |  | 4,675 |  |  |  | 4,644 |  |  |  | 4,656 |  |  |  | 4,642 |
Unvested participating shares |  |  | 331 |  |  |  | 387 |  |  |  | 366 |  |  |  | 393 |
|  |  | 19,999 |  |  |  | 19,936 |  |  |  | 19,982 |  |  |  | 19,907 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 1.51 |  |  | $ | 1.45 |  |  | $ | 4.53 |  |  | $ | 3.83 |
Class B Common Stock |  | $ | 1.21 |  |  | $ | 1.16 |  |  | $ | 3.63 |  |  | $ | 3.06 |
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] |
|  | 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 |
|  | Thirteen weeks ended May 26, 2012 |  |  | Thirty-nine weeks ended May 26, 2012 |
|  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |  |  | Earnings to Common Shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 21,587 |  |  |  | 14,905 |  |  | $ | 1.45 |  |  | $ | 56,926 |  |  |  | 14,872 |  |  | $ | 3.83 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  | — |  |  |  | 97 |  |  |  |  |  |  |  | — |  |  |  | 86 |  |  |  |  |
Class B Common Stock |  |  | 5,381 |  |  |  | 4,644 |  |  |  |  |  |  |  | 14,214 |  |  |  | 4,642 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 478 |  |  |  | — |  |  |  |  |  |  |  | 1,279 |  |  |  | — |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (453 | ) |  |  | — |  |  |  |  |  |  |  | (1,214 | ) |  |  | — |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 26,993 |  |  |  | 19,646 |  |  | $ | 1.37 |  |  | $ | 71,205 |  |  |  | 19,600 |  |  | $ | 3.63 |

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