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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Net sales	$ 91,755	$ 155,274	$ 149,807	$ 93,729	$ 74,937	$ 139,300	$ 134,192	$ 85,298	$ 490,565	$ 433,727	$ 430,489
Gross profit	38,832	70,630	64,913	36,565	28,885	59,283	54,995	33,299	210,940	176,462	171,733
Operating profit (loss)	(76)	24,737	20,458	472	(4,927)	13,583	15,138	(900)	45,591	22,894	17,853
Income (loss) before income taxes	858	25,560	21,837	(45)	(4,360)	13,865	14,669	(519)	48,210	23,655	15,753
Income tax expense (benefit)	269	9,007	7,878	(4,101)	(2,233)	7,024	5,348	15	13,053	10,154	5,137
Net income	$ 589	$ 16,553	$ 13,959	$ 4,056	$ (2,127)	$ 6,841	$ 9,321	$ (534)	$ 35,157	$ 13,501	$ 10,616
Class A
Net income (loss) per common share - Basic (USD per share)	$ 0.06	$ 1.68	$ 1.41	$ 0.41	$ (0.21)	$ 0.69	$ 0.94	$ (0.05)	$ 3.56	$ 1.36	$ 1.08
Net income per common share - Diluted (USD per share)	0.06	1.65	1.39	0.40	(0.21)	0.68	0.93	(0.05)	3.51	1.34	1.06
Class B
Net income (loss) per common share - Basic (USD per share)	0.05	1.52	1.28	0.37	(0.21)	0.63	0.86	(0.05)	3.23	1.24	0.98
Net income per common share - Diluted (USD per share)	$ 0.06	$ 1.65	$ 1.39	$ 0.40	$ (0.21)	$ 0.68	$ 0.93	$ (0.05)	$ 3.51	$ 1.34	$ 1.06

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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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