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Summary of Significant Accounting Policies, Schedule of Earnings Per Share, Basic, 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, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 18,014 | $ 18,431 | $ 16,277 | $ 23,764 | $ 17,292 | $ 19,314 | $ 16,226 | $ 23,576 | $ 76,486 | $ 76,408 | $ 75,852
Weighted average number of shares - basic |  |  |  |  |  |  |  |  | 19,854 | 19,564 | 19,329
Earning per share - basic (in amounts per share) |  |  |  |  |  |  |  |  | $ 4.05 | $ 4.11 | $ 4.14
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 59,944 | 59,921 | 59,526
Weighted average number of shares - basic |  |  |  |  |  |  |  |  | 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, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 15,104 | 15,875 | 16,326
Weighted average number of shares - basic | 4,653 | 4,656 | 4,661 | 4,663 | 4,663 | 4,766 | 4,931 | 4,932 | 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
Unvested Participating Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 1,438 | $ 612 | $ 0
Weighted average number of shares - basic |  |  |  |  |  |  |  |  | 405 | 171 | 0

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