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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, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Aug. 25, 2012 | May 26, 2012 | Feb. 25, 2012 | Nov. 26, 2011 | Aug. 27, 2011 | May 28, 2011 | Feb. 26, 2011 | Nov. 27, 2010 | Aug. 25, 2012 | Aug. 27, 2011 | Aug. 28, 2010
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 22,532 | $ 27,459 | [1] | $ 19,196 | $ 25,802 | $ 18,014 | $ 18,431 | $ 16,277 | $ 23,764 | $ 94,989 | $ 76,486 | $ 76,408
Weighted average number of shares - basic |  |  |  |  |  |  |  |  |  | 19,916 | 19,854 | 19,564
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 74,643 | 59,944 | 59,921
Weighted average number of shares - basic |  |  |  |  |  |  |  |  |  | 14,882 | 14,791 | 14,570
Earning per share - basic (in amounts per share) |  |  |  |  |  |  |  |  |  | $ 5.02 | $ 4.05 | $ 4.11
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 18,630 | 15,104 | 15,875
Weighted average number of shares - basic | 4,647 | 4,644 |  | 4,640 | 4,641 | 4,653 | 4,656 | 4,661 | 4,663 | 4,643 | 4,658 | 4,823
Earning per share - basic (in amounts per share) | $ 0.95 | $ 1.16 | [1] | $ 0.81 | $ 1.09 | $ 0.76 | $ 0.78 | $ 0.69 | $ 1.01 | $ 4.01 | $ 3.24 | $ 3.29
Unvested Participating Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ 1,716 | $ 1,438 | $ 612
Weighted average number of shares - basic |  |  |  |  |  |  |  |  |  | 391 | 405 | 171
[1] | In the third fiscal quarter of 2012, operating results benefited from a settlement of environmental litigation that resulted in the Company recording a $6.7 million pre-tax gain. This gain translated into a $0.21 benefit to the Company's diluted earnings per share.

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