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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Income Statement [Abstract]      
Amortization of prior service credit (net of tax of $2,068, $1,944, and $1,791) $ 2,110 $ 2,068 $ 1,944
Amortization of net actuarial loss (net of tax of $337, $361, and $387) 565 337 361
(Increase) decrease in actuarial loss (net of tax of $$1,348, $2,177, and $3,894) 250 1,348 2,177
Plan amendment (net of tax of $1,364, $1,613, and $1,729) 1,509 1,364 1,613
Unrealized appreciation (depreciation) of investments (net of tax of $91, $125, and $189) $ 0 $ 91 $ 125