Note 9 - Accrued Liabilities (Details) - Summary of Current and Long-Term Accrued Liabilities - USD ($) $ in Thousands	Aug. 29, 2015	Aug. 30, 2014
Current liabilities:
Payroll and benefit related	$ 48,932	$ 48,978
Insurance related	40,123	37,683
Environmental related	7,254	5,046
Other	16,713	9,111
	113,022	100,818
Long-term liabilities:
Benefit related	26,132	23,760
Environmental related	16,053	14,800
Asset retirement obligations	12,381	11,675
	54,566	50,235
Total accrued liabilities	$ 167,588	$ 151,053