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Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Aug. 30, 2014 | May 31, 2014 | Mar. 01, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 25, 2013 | Feb. 23, 2013 | Nov. 24, 2012 | Aug. 30, 2014 | Aug. 31, 2013 | Aug. 25, 2012
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 351,988 | $ 352,238 | $ 343,967 | $ 346,704 | $ 352,876 | $ 335,764 | $ 334,306 | $ 332,569 | $ 1,394,897 | $ 1,355,515 | $ 1,256,289
Income before income taxes | 47,657 | 50,114 | 41,224 | 56,356 | 48,137 | 45,831 | 43,215 | 50,426 | 195,351 | 187,609 | 150,734
Provision for income taxes | 18,785 | 19,170 | 15,577 | 21,894 | 17,576 | 17,109 | 16,573 | 19,666 | 75,426 | 70,924 | 55,745
Net income | 28,872 | 30,944 | 25,647 | 34,462 | 30,561 | 28,722 | 26,642 | 30,760 | 119,925 | 116,685 | 94,989
Common Stock (in Dollars per share) | $ 1.43 | $ 1.53 | $ 1.27 | $ 1.71 | $ 1.52 | $ 1.43 | $ 1.33 | $ 1.54 | $ 5.95 | $ 5.81 | $ 4.76
Income allocated to – Basic |  |  |  |  |  |  |  |  | 119,925 | 116,685 | 94,989
Common Stock | 28,631 | 30,637 | 25,326 | 34,031 | 30,178 | 28,307 | 26,196 | 30,244 | 118,626 | 114,927 | 93,358
Common Stock (in Shares) | 20,007 | 19,977 | 19,924 | 19,891 | 19,882 | 19,820 | 19,747 | 19,693 | 19,939 | 19,789 | 19,616
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income per share – Basic (in Dollars per share) | $ 1.51 | $ 1.62 | $ 1.34 | $ 1.81 | $ 1.61 | $ 1.51 | $ 1.40 | $ 1.62 | $ 6.29 | $ 6.14 | $ 5.02
Income allocated to – Basic | 22,876 | 24,493 | 20,267 | 27,208 | 24,123 | 22,638 | 20,963 | 24,191 | 94,849 | 91,916 | 74,643
Weighted average number of shares outstanding – Basic (in Shares) | 15,113 | 15,102 | 15,077 | 15,029 | 15,017 | 14,993 | 14,962 | 14,925 | 15,080 | 14,975 | 14,882
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income per share – Basic (in Dollars per share) | $ 1.21 | $ 1.30 | $ 1.08 | $ 1.45 | $ 1.29 | $ 1.21 | $ 1.12 | $ 1.30 | $ 5.03 | $ 4.91 | $ 4.01
Income allocated to – Basic | $ 5,742 | $ 6,127 | $ 5,041 | $ 6,798 | $ 6,033 | $ 5,647 | $ 5,209 | $ 6,025 | $ 23,705 | $ 22,913 | $ 18,630
Weighted average number of shares outstanding – Basic (in Shares) | 4,741 | 4,722 | 4,687 | 4,693 | 4,694 | 4,675 | 4,647 | 4,647 | 4,711 | 4,666 | 4,643

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