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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Net sales	$ 91,132	$ 170,779	$ 165,778	$ 116,579	$ 91,755	$ 155,274	$ 149,807	$ 93,729	$ 544,268	$ 490,565	$ 433,727
Gross profit	39,521	79,333	74,195	48,811	38,832	70,630	64,913	36,565	241,860	210,940	176,462
Operating profit (loss)	(1,973)	31,955	26,002	7,037	(76)	24,737	20,458	472	63,021	45,591	22,894
Income (loss) before income taxes	(1,442)	31,779	29,445	8,324	858	25,560	21,837	(45)	68,106	48,210	23,655
Income tax expense (benefit)	3,514	8,009	7,825	8,089	269	9,007	7,878	(4,101)	27,437	13,053	10,154
Net income	$ (4,956)	$ 23,770	$ 21,620	$ 235	$ 589	$ 16,553	$ 13,959	$ 4,056	$ 40,669	$ 35,157	$ 13,501
Class A
Net income (loss) per common share - Basic (USD per share)	$ (0.50)	$ 2.40	$ 2.19	$ 0.02	$ 0.06	$ 1.68	$ 1.41	$ 0.41	$ 4.12	$ 3.56	$ 1.36
Net income per common share - Diluted (USD per share)	(0.49)	2.37	2.15	0.02	0.06	1.65	1.39	0.40	4.05	3.51	1.34
Class B
Net income (loss) per common share - Basic (USD per share)	(0.46)	2.19	1.99	0.02	0.05	1.52	1.28	0.37	3.74	3.23	1.24
Net income per common share - Diluted (USD per share)	$ (0.49)	$ 2.37	$ 2.15	$ 0.02	$ 0.06	$ 1.65	$ 1.39	$ 0.40	$ 4.05	$ 3.51	$ 1.34

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