CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Net sales	$ 170,779	$ 155,274	$ 453,136	$ 398,810
Cost of sales	91,446	84,644	250,797	226,702
Gross profit	79,333	70,630	202,339	172,108
Operating expenses:
Marketing and selling	31,191	29,438	89,280	79,056
Administrative management, finance and information systems	11,071	11,584	32,713	33,146
Research and development	5,116	4,871	15,352	14,239
Total operating expenses	47,378	45,893	137,345	126,441
Operating profit	31,955	24,737	64,994	45,667
Interest income	(172)	(52)	(493)	(84)
Interest expense	55	77	170	687
Other (income) expense, net	293	(848)	(4,231)	(2,288)
Profit before income taxes	31,779	25,560	69,548	47,352
Income tax expense	8,009	9,007	23,923	12,784
Net income	$ 23,770	$ 16,553	$ 45,625	$ 34,568
Weighted avage common shares - Basic:
Participating securities (shares)	50	28	49	26
Weighted average common shares - Dilutive (shares)	10,001	9,928	9,988	9,908
Class A
Weighted avage common shares - Basic:
Weighted average common shares - Basic (shares)	8,739	8,688	8,727	8,670
Net income per common share - Basic:
Net income per common share - Basic (USD per share)	$ 2.40	$ 1.68	$ 4.62	$ 3.50
Net income per common share - Diluted:
Net income per common share - Diluted (USD per share)	2.37	1.65	4.54	3.45
Dividends declared per common share:
Dividends declared per common share (USD per share)	$ 0.12	$ 0.09	$ 0.32	$ 0.27
Class B
Weighted avage common shares - Basic:
Weighted average common shares - Basic (shares)	1,212	1,212	1,212	1,212
Net income per common share - Basic:
Net income per common share - Basic (USD per share)	$ 2.19	$ 1.52	$ 4.20	$ 3.18
Net income per common share - Diluted:
Net income per common share - Diluted (USD per share)	2.37	1.65	4.54	3.45
Dividends declared per common share:
Dividends declared per common share (USD per share)	$ 0.1091	$ 0.08	$ 0.291	$ 0.25