Consolidated Statements of Income and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Income Statement [Abstract]
Amortization of prior service credit (net of tax of $2,068, $1,944, and $1,791)	$ 2,068	$ 1,944	$ 1,791
Amortization of net actuarial loss (net of tax of $337, $361, and $387)	337	361	387
(Increase) decrease in actuarial loss (net of tax of $$1,348, $2,177, and $3,894)	1,348	2,177	3,894
Plan amendment (net of tax of $1,364, $1,613, and $1,729)	1,364	1,613	1,729
Unrealized appreciation (depreciation) of investments (net of tax of $91, $125, and $189)	$ 91	$ 125	$ 189