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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. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 27, 2013
Sep. 28, 2012
Sep. 30, 2011
Net sales $ 77,315 $ 129,772 $ 132,100 $ 87,274 $ 74,795 $ 128,595 $ 128,726 $ 80,176 $ 426,461 $ 412,292 $ 407,422
Gross profit 28,814 54,337 54,084 33,814 28,447 54,247 50,527 31,101 171,049 164,322 163,135
Operating profit (loss) (4,706) 16,133 12,638 1,526 (3,071) 14,222 13,981 (3,719) 25,591 21,413 17,670
Income (loss) before income taxes (4,523) 15,510 13,063 610 (4,294) 14,044 13,278 (3,102) 24,660 19,926 12,250
Income tax expense (benefit) (1,012) 1,856 4,126 363 (1,094) 5,049 5,995 (158) 5,333 9,792 (20,394)
Net income $ (3,511) $ 13,654 $ 8,937 $ 247 $ (3,200) $ 8,995 $ 7,283 $ (2,944) $ 19,327 $ 10,134 $ 32,644
Class A [Member]
                      
Net income (loss) per common share - Basic $ (0.36) $ 1.39 $ 0.91 $ 0.03 $ (0.33) $ 0.92 $ 0.75 $ (0.30) $ 1.98 $ 1.04 $ 3.40
Net income (loss) per common share - Diluted $ (0.35) $ 1.37 $ 0.90 $ 0.02 $ (0.32) $ 0.91 $ 0.74 $ (0.30) $ 1.95 $ 1.03 $ 3.36
Class B [Member]
                      
Net income (loss) per common share - Basic $ (0.33) $ 1.26 $ 0.83 $ 0.02 $ (0.28) $ 0.84 $ 0.68 $ (0.30) $ 1.79 $ 0.94 $ 3.07
Net income (loss) per common share - Diluted $ (0.35) $ 1.37 $ 0.90 $ 0.02 $ (0.32) $ 0.91 $ 0.74 $ (0.30) $ 1.95 $ 1.03 $ 3.36