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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Net sales	$ 104,019	$ 176,253	$ 177,707	$ 104,440	$ 91,132	$ 170,779	$ 165,778	$ 116,579	$ 562,419	$ 544,268	$ 490,565
Gross profit	46,583	79,725	79,129	44,319	39,521	79,333	74,195	48,811	249,756	241,860	210,940
Operating profit (loss)	1,923	28,029	27,844	5,978	(1,973)	31,955	26,002	7,037	63,774	63,021	45,591
Income (loss) before income taxes	3,264	28,892	30,020	4,331	(1,442)	31,779	29,445	8,324	66,507	68,106	48,210
Income tax expense	(639)	6,826	8,097	810	3,514	8,009	7,825	8,089	15,094	27,437	13,053
Net income	$ 3,903	$ 22,066	$ 21,923	$ 3,521	$ (4,956)	$ 23,770	$ 21,620	$ 235	$ 51,413	$ 40,669	$ 35,157
Class A
Net income (loss) per common share - Basic (USD per share)	$ 0.49	$ 2.22	$ 2.21	$ 0.36	$ (0.50)	$ 2.40	$ 2.19	$ 0.02	$ 5.18	$ 4.12	$ 3.56
Net income per common share - Diluted (USD per share)	0.49	2.19	2.18	0.35	(0.49)	2.37	2.15	0.02	5.11	4.05	3.51
Class B
Net income (loss) per common share - Basic (USD per share)	0.45	2.02	2.01	0.32	(0.46)	2.19	1.99	0.02	4.71	3.74	3.23
Net income per common share - Diluted (USD per share)	$ 0.49	$ 2.19	$ 2.18	$ 0.35	$ (0.49)	$ 2.37	$ 2.15	$ 0.02	$ 5.11	$ 4.05	$ 3.51

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