Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Feb. 24, 2018	Aug. 26, 2017
Receivables, reserves	$ 11,538	$ 8,719
Accumulated depreciation	$ 730,702	$ 702,325
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	15,492,219	15,453,308
Common stock, shares outstanding (in shares)	15,492,219	15,453,308
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	4,815,519	4,815,519
Common stock, shares outstanding (in shares)	4,815,519	4,815,519