Note 11 - Commitments and Contingencies - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities (Details) - USD ($) $ in Thousands	Feb. 25, 2017	Aug. 27, 2016
Estimated costs – current dollars, remainder of fiscal year	$ 8,653
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	12,392
Estimated costs – current dollars, total	26,852
Estimated insurance proceeds, remainder of fiscal year	(104)
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	(1,130)
Estimated insurance proceeds, total	(1,898)
Net anticipated costs, remainder of fiscal year	8,549
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	24,954
Effect of inflation	7,556
Effect of discounting	(7,847)
Balance as of February 25, 2017	$ 24,663	$ 26,748