Note 10 - Commitments and Contingencies (Details) - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Aug. 30, 2014
Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities [Abstract]
Estimated costs – current dollars	$ 3,536
Estimated costs – current dollars	4,940
Estimated costs – current dollars	1,663
Estimated costs – current dollars	745
Estimated costs – current dollars	863
Estimated costs – current dollars	12,406
Estimated costs – current dollars	24,153
Estimated insurance proceeds	(107)
Estimated insurance proceeds	(159)
Estimated insurance proceeds	(173)
Estimated insurance proceeds	(159)
Estimated insurance proceeds	(173)
Estimated insurance proceeds	(1,430)
Estimated insurance proceeds	(2,201)
Net anticipated costs	3,429
Net anticipated costs	4,781
Net anticipated costs	1,490
Net anticipated costs	586
Net anticipated costs	690
Net anticipated costs	10,976
Net anticipated costs	21,952
Effect of inflation	7,377
Effect of discounting	(6,828)
Balance as of February 28, 2015	$ 22,501	$ 19,846