Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Aug. 25, 2012	Aug. 27, 2011
Assets
Receivable reserves	$ 5,152	$ 4,201
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)	15,064,069	14,987,371
Common Stock, shares outstanding (in shares)	15,064,069	14,987,371
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)	4,885,277	4,887,777
Common Stock, shares outstanding (in shares)	4,885,277	4,887,777