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Quarterly Financial Summary (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 30, 2011
Jul. 01, 2011
Apr. 01, 2011
Dec. 31, 2010
Oct. 01, 2010
Jul. 02, 2010
Apr. 02, 2010
Jan. 01, 2010
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Net sales $ 74,795 $ 128,595 $ 128,726 $ 80,176 $ 77,377 $ 122,481 $ 128,864 $ 78,700 $ 75,121 $ 123,954 $ 112,897 $ 70,460 $ 412,292 $ 407,422 $ 382,432
Gross profit 28,447 54,247 50,527 31,101 28,994 50,528 52,933 30,680 30,294 51,487 45,386 26,356 164,322 163,135 153,523
Operating profit (loss) (3,071) 14,222 13,981 (3,719) (4,229) 11,810 11,424 (1,335) (3,298) 13,353 8,054 (3,555) 21,413 17,670 14,554
Income (loss) before income taxes (4,294) 14,044 13,278 (3,102) (4,791) 9,106 10,088 (2,153) (4,598) 11,421 6,401 (4,032) 19,926 12,250 9,192
Income tax expense (benefit) (1,094) 5,049 5,995 (158) (22,068) 988 1,602 (916) 1,242 989 218 204 9,792 (20,394) 2,653
Net income (loss) $ (3,200) $ 8,995 $ 7,283 $ (2,944) $ 17,277 $ 8,118 $ 8,486 $ (1,237) $ (5,840) $ 10,432 $ 6,183 $ (4,236) $ 10,134 $ 32,644 $ 6,539
Class A [Member]
                              
Net income (loss) per common share - Basic $ (0.33) $ 0.92 $ 0.75 $ (0.30) $ 1.80 $ 0.84 $ 0.89 $ (0.13) $ (0.62) $ 1.10 $ 0.66 $ (0.45) $ 1.04 $ 3.40 $ 0.69
Net income (loss) per common share - Diluted $ (0.32) $ 0.91 $ 0.74 $ (0.30) $ 1.77 $ 0.83 $ 0.87 $ (0.13) $ (0.61) $ 1.09 $ 0.64 $ (0.45) $ 1.03 $ 3.36 $ 0.68
Class B [Member]
                              
Net income (loss) per common share - Basic $ (0.28) $ 0.84 $ 0.68 $ (0.30) $ 1.62 $ 0.76 $ 0.80 $ (0.13) $ (0.56) $ 1.00 $ 0.59 $ (0.45) $ 0.94 $ 3.07 $ 0.63
Net income (loss) per common share - Diluted $ (0.32) $ 0.91 $ 0.74 $ (0.30) $ 1.77 $ 0.83 $ 0.87 $ (0.13) $ (0.61) $ 1.09 $ 0.64 $ (0.45) $ 1.03 $ 3.36 $ 0.68