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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Aug. 26, 2017 | May 27, 2017 | Feb. 25, 2017 | Nov. 26, 2016 | Aug. 27, 2016 | May 28, 2016 | Feb. 27, 2016 | Nov. 28, 2015 | Aug. 26, 2017 | Aug. 27, 2016 | Aug. 29, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
As reported – Basic |  |  |  |  |  |  |  |  | $ 70,196 | $ 125,026 | $ 124,299
As reported - Basic (in shares) |  |  |  |  |  |  |  |  | 20,284 | 20,168 | 20,098
Add: Undistributed earnings allocated to unvested participating shares |  |  |  |  |  |  |  |  | $ 362 | $ 636 | $ 853
Less: Undistributed earnings reallocated to unvested participating shares |  |  |  |  |  |  |  |  | (343) | (602) | (807)
Diluted EPS – Common Stock |  |  |  |  |  |  |  |  | $ 69,837 | $ 124,409 | $ 123,472
Diluted EPS – Common Stock (in shares) |  |  |  |  |  |  |  |  | 20,276 | 20,154 | 20,079
Diluted EPS – Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.44 | $ 6.17 | $ 6.15
Common Stock |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
As reported – Basic | $ (3,908) | $ 19,307 | $ 17,836 | $ 22,342 | $ 28,097 | $ 23,939 | $ 18,691 | $ 28,539 | $ 55,903 | $ 99,282 | $ 98,665
As reported - Basic (in shares) | 15,402 | 15,326 | 15,305 | 15,285 | 15,268 | 15,253 | 15,241 | 15,218 | 15,382 | 15,245 | 15,182
As reported - Basic (in dollars per share) | $ (0.25) | $ 1.26 | $ 1.17 | $ 1.46 | $ 1.84 | $ 1.57 | $ 1.23 | $ 1.88 | $ 3.63 | $ 6.51 | $ 6.50
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Add: effect of dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  | 108 | 93 | 134
Diluted EPS – Common Stock | $ (4,886) | $ 24,199 | $ 22,362 | $ 28,020 | $ 35,250 | $ 30,007 | $ 23,401 | $ 35,741 |  |  |
Diluted EPS – Common Stock (in shares) | 20,220 | 20,279 | 20,263 | 20,249 | 20,223 | 20,183 | 20,138 | 20,132 |  |  |
Diluted EPS – Common Stock (in dollars per share) | $ (0.24) | $ 1.19 | $ 1.10 | $ 1.38 | $ 1.74 | $ 1.49 | $ 1.16 | $ 1.78 |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
As reported – Basic | $ (978) | $ 4,883 | $ 4,518 | $ 5,668 | $ 7,139 | $ 6,061 | $ 4,704 | $ 7,193 | $ 13,915 | $ 25,093 | $ 24,761
As reported - Basic (in shares) | 4,818 | 4,846 | 4,846 | 4,847 | 4,850 | 4,827 | 4,795 | 4,795 | 4,786 | 4,816 | 4,763
As reported - Basic (in dollars per share) | $ (0.20) | $ 1.01 | $ 0.93 | $ 1.17 | $ 1.47 | $ 1.26 | $ 0.98 | $ 1.50 | $ 2.91 | $ 5.21 | $ 5.20
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  | $ 13,915 | $ 25,093 | $ 24,761
Add: effect of dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  | 4,786 | 4,816 | 4,763

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