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Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Aug. 31, 2013 | Aug. 25, 2012 | Aug. 27, 2011
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |
Revenues | $ 1,355,515 | $ 1,256,289 |  | $ 1,134,126
Income before income taxes | 187,609 | 150,734 |  | 120,572
Provision for income taxes | 70,924 | 55,745 |  | 44,086
Net income | 116,685 | 94,989 |  | 76,486
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 116,685 | 94,989 |  | 76,486
Common Class B [Member] |  |  |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 4.91 | $ 4.01 |  | $ 3.24
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 22,913 | 18,630 |  | 15,104
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 4,666 | 4,643 |  | 4,658
Common Class B [Member] | First Quarter [Member] |  |  |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.30 | $ 1.09 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 6,025 | 5,068 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 4,647 | 4,641 |  |
Common Class B [Member] | Second Quarter [Member] |  |  |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.12 | $ 0.81 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 5,209 | 3,765 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 4,647 | 4,640 |  |
Common Class B [Member] | Third Quarter [Member] |  |  |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.21 | $ 1.16 | [1] |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 5,647 | 5,381 | [1] |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 4,675 | 4,644 | [1] |
Common Class B [Member] | Fourth Quarter [Member] |  |  |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.29 | $ 0.95 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 6,033 | 4,416 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 4,694 | 4,647 |  |
First Quarter [Member] |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |
Revenues | 332,569 | 313,025 |  |
Income before income taxes | 50,426 | 41,785 |  |
Provision for income taxes | 19,666 | 15,983 |  |
Net income | 30,760 | 25,802 |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.62 | $ 1.37 |  |
Income per share – diluted |  |  |  |
Income per share common stock - Diluted (in Dollars per share) | $ 1.54 | $ 1.30 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 24,191 | 20,258 |  |
Income allocated to – diluted |  |  |  |
Income allocated to common stock - diluted | 30,244 | 25,350 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 14,925 | 14,838 |  |
Weighted average number of shares outstanding – diluted |  |  |  |
Weighted average number of shares outstanding - diluted (in Shares) | 19,693 | 19,557 |  |
Second Quarter [Member] |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |
Revenues | 334,306 | 309,959 |  |
Income before income taxes | 43,215 | 31,086 |  |
Provision for income taxes | 16,573 | 11,890 |  |
Net income | 26,642 | 19,196 |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.40 | $ 1.01 |  |
Income per share – diluted |  |  |  |
Income per share common stock - Diluted (in Dollars per share) | $ 1.33 | $ 0.96 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 20,963 | 15,081 |  |
Income allocated to – diluted |  |  |  |
Income allocated to common stock - diluted | 26,196 | 18,863 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 14,962 | 14,873 |  |
Weighted average number of shares outstanding – diluted |  |  |  |
Weighted average number of shares outstanding - diluted (in Shares) | 19,747 | 19,605 |  |
Third Quarter [Member] |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |
Revenues | 335,764 | 320,931 | [1] |
Income before income taxes | 45,831 | 42,360 | [1] |
Provision for income taxes | 17,109 | 14,901 | [1] |
Net income | 28,722 | 27,459 | [1] |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.51 | $ 1.45 | [1] |
Income per share – diluted |  |  |  |
Income per share common stock - Diluted (in Dollars per share) | $ 1.43 | $ 1.37 | [1] |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 22,638 | 21,587 | [1] |
Income allocated to – diluted |  |  |  |
Income allocated to common stock - diluted | 28,307 | 26,993 | [1] |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 14,993 | 14,905 | [1] |
Weighted average number of shares outstanding – diluted |  |  |  |
Weighted average number of shares outstanding - diluted (in Shares) | 19,820 | 19,646 | [1] |
Fourth Quarter [Member] |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |
Revenues | 352,876 | 312,374 |  |
Income before income taxes | 48,137 | 35,503 |  |
Provision for income taxes | 17,576 | 12,971 |  |
Net income | 30,561 | 22,532 |  |
Income per share – basic |  |  |  |
Income per share common stock - basic (in Dollars per share) | $ 1.61 | $ 1.19 |  |
Income per share – diluted |  |  |  |
Income per share common stock - Diluted (in Dollars per share) | $ 1.52 | $ 1.13 |  |
Income allocated to – basic |  |  |  |
Income allocated to common stock - basic | 24,123 | 17,717 |  |
Income allocated to – diluted |  |  |  |
Income allocated to common stock - diluted | $ 30,178 | $ 22,153 |  |
Weighted average number of shares outstanding – basic |  |  |  |
Weighted average number of shares outstanding - basic (in Shares) | 15,017 | 14,912 |  |
Weighted average number of shares outstanding – diluted |  |  |  |
Weighted average number of shares outstanding - diluted (in Shares) | 19,882 | 19,664 |  |
[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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