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Accrued Liabilities (Details) (USD $) In Thousands | Aug. 27, 2011 | Aug. 28, 2010
--- | --- | ---
Current liabilities [Abstract] |  |
Payroll and benefit related | $ 28,362 | $ 28,809
Insurance related | 32,836 | 29,134
Environmental related | 4,174 | 3,888
Other | 11,258 | 13,074
Total current accrued liabilities | 76,630 | 74,905
Long-term liabilities [Abstract] |  |
Benefit related | 16,016 | 15,192
Environmental related | 14,194 | 15,098
Asset retirement obligations | 9,488 | 8,899
Total long-term accrued liabilities | 39,698 | 39,189
Total accrued liabilities | $ 116,328 | $ 114,094

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