Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Property, plant and equipment, accumulated depreciation	$ 95,397	$ 97,229	$ 90,442
Treasury stock, shares	6,105	0	172
Class A [Member]
Common stock, shares issued	8,652,186	8,567,549	8,506,100
Common stock, shares outstanding	8,652,186	8,567,549	8,506,100
Class B [Member]
Common stock, shares issued	1,215,842	1,215,842	1,216,464
Common stock, shares outstanding	1,215,842	1,215,842	1,216,464