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Summary of Significant Accounting Policies, Schedule of Earnings Per Share, Diluted, Two Class Method (Details) (USD $) In Thousands, except Per Share data | 3 Months Ended | 12 Months Ended
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Aug. 27, 2011 | May 28, 2011 | Feb. 26, 2011 | Nov. 27, 2010 | Aug. 28, 2010 | May 29, 2010 | Feb. 27, 2010 | Nov. 28, 2009 | Aug. 27, 2011 | Aug. 28, 2010 | Aug. 29, 2009
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings allocated to unvested participating shares |  |  |  |  |  |  |  |  | $ 1,385 | $ 598 |
Undistributed earnings reallocated to unvested participating shares |  |  |  |  |  |  |  |  | (1,315) | (567) |
Diluted EPS - Common Stock |  |  |  |  |  |  |  |  | 75,118 | 75,827 | 75,852
Common Stock options (in shares) |  |  |  |  |  |  |  |  | 83 | 65 | 44
Diluted EPS - Common Stock (in shares) |  |  |  |  |  |  |  |  | 19,532 | 19,458 | 19,373
Earning per share - basic (in amounts per share) |  |  |  |  |  |  |  |  | $ 4.05 | $ 4.11 | $ 4.14
Diluted EPS - Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.85 | $ 3.90 | $ 3.92
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 59,944 | 59,921 | 59,526
Diluted EPS - Common Stock (in shares) |  |  |  |  |  |  |  |  | 14,791 | 14,570 | 14,394
Earning per share - basic (in amounts per share) |  |  |  |  |  |  |  |  | $ 4.05 | $ 4.11 |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 3,549 | $ 3,635 | $ 3,218 | $ 4,704 | $ 3,424 | $ 3,949 | $ 3,476 | $ 5,060 | $ 15,104 | $ 15,875 | $ 16,326
Diluted EPS - Common Stock (in shares) |  |  |  |  |  |  |  |  | 4,658 | 4,823 | 4,935
Earning per share - basic (in amounts per share) | $ 0.76 | $ 0.78 | $ 0.69 | $ 1.01 | $ 0.73 | $ 0.83 | $ 0.71 | $ 1.03 | $ 3.24 | $ 3.29 | $ 3.31

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