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Quarterly Financial Summary (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Sep. 30, 2016	Oct. 02, 2015	Oct. 03, 2014
Net sales	$ 74,937	$ 139,300	$ 134,192	$ 85,298	$ 85,673	$ 140,883	$ 133,111	$ 70,822	$ 433,727	$ 430,489	$ 425,410
Gross profit	28,885	59,283	54,995	33,299	33,711	58,752	51,936	27,334	176,462	171,733	168,613
Operating profit (loss)	(4,927)	13,583	15,138	(900)	1,140	16,421	7,623	(7,331)	22,894	17,853	16,691
Income (loss) before income taxes	(4,360)	13,865	14,669	(519)	(244)	16,101	6,820	(6,924)	23,655	15,753	17,422
Income tax expense (benefit)	(2,233)	7,024	5,348	15	(1,411)	6,104	3,174	(2,730)	10,154	5,137	8,299
Net income (loss)	$ (2,127)	$ 6,841	$ 9,321	$ (534)	$ 1,167	$ 9,997	$ 3,646	$ (4,194)	$ 13,501	$ 10,616	$ 9,123
Class A [Member]
Net income (loss) per common share - Basic	$ (0.21)	$ 0.69	$ 0.94	$ (0.05)	$ 0.12	$ 1.01	$ 0.37	$ (0.42)	$ 1.36	$ 1.08	$ 0.93
Net (loss) income per common share - Diluted	(0.21)	0.68	0.93	(0.05)	0.12	1.00	0.36	(0.42)	1.34	1.06	0.90
Class B [Member]
Net income (loss) per common share - Basic	(0.21)	0.63	0.86	(0.05)	0.11	0.92	0.34	(0.42)	1.24	0.98	0.84
Net (loss) income per common share - Diluted	$ (0.21)	$ 0.68	$ 0.93	$ (0.05)	$ 0.12	$ 1.00	$ 0.36	$ (0.42)	$ 1.34	$ 1.06	$ 0.90

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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