Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Aug. 27, 2011	Aug. 28, 2010
Assets
Receivable reserves	$ 4,201	$ 4,102
Shareholders' equity:
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 Class A [Member]
Shareholders' equity:
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, issued (in shares)	14,987,371	14,913,379
Common Stock, shares outstanding (in shares)	14,987,371	14,913,379
Common Class B [Member]
Shareholders' equity:
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, issued (in shares)	4,887,777	4,913,369
Common Stock, shares outstanding (in shares)	4,887,777	4,913,369