Note 11 - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities (Details) - USD ($) $ in Thousands	Aug. 27, 2016	Aug. 29, 2015	Aug. 30, 2014
Estimated costs – current dollars, year one	$ 9,673
Estimated costs – current dollars, year two	1,859
Estimated costs – current dollars, year three	1,492
Estimated costs – current dollars, year four	1,284
Estimated costs – current dollars, year five	1,172
Estimated costs – current dollars, thereafter	12,390
Estimated costs – current dollars, total	27,870
Estimated insurance proceeds, year one	(173)
Estimated insurance proceeds, year two	(159)
Estimated insurance proceeds, year three	(173)
Estimated insurance proceeds, year four	(159)
Estimated insurance proceeds, year five	(173)
Estimated insurance proceeds, thereafter	(1,128)
Estimated insurance proceeds, total	(1,965)
Net anticipated costs, , year one	9,500
Net anticipated costs, year two	1,700
Net anticipated costs, year three	1,319
Net anticipated costs, year four	1,125
Net anticipated costs, year five	999
Net anticipated costs, thereafter	11,262
Net anticipated costs, total	25,905
Effect of inflation	7,256
Effect of discounting	(6,413)
Balance as of August 27, 2016	$ 26,748	$ 23,307	$ 19,846