Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Revenue
Revenue	$ 233,046	$ 191,323	$ 436,227	$ 385,485
Cost of Sales
Total cost of sales	145,696	116,498	270,572	232,732
Gross profit	87,350	74,825	165,655	152,753
Operating expenses
Selling and marketing	33,395	30,597	65,484	62,625
General and administrative	22,105	18,992	43,183	39,554
Research and development	7,676	8,626	14,848	17,467
Total operating expenses	63,176	58,215	123,515	119,646
Income from operations	24,174	16,610	42,140	33,107
Interest expense, net	(7,368)	(6,708)	(14,186)	(13,512)
Other income (expense), net	270	274	319	51
Income before income taxes	17,076	10,176	28,273	19,646
Income tax provision (benefit)	2,916	1,738	3,612	(21,943)
Net income	$ 14,160	$ 8,438	$ 24,661	$ 41,589
Basic
Earnings per share (in dollars per share)	$ 0.74	$ 0.44	$ 1.28	$ 2.17
Weighted average common shares outstanding (in shares)	19,251	19,150	19,234	19,137
Diluted
Earnings per share (in dollars per share)	$ 0.73	$ 0.44	$ 1.27	$ 2.16
Weighted average common shares outstanding (in shares)	19,441	19,273	19,393	19,258
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Product
Revenue
Revenue	$ 206,690	$ 165,453	$ 381,769	$ 334,694
Cost of Sales
Cost of goods and services sold	129,579	101,133	237,746	201,627
Service
Revenue
Revenue	26,356	25,870	54,458	50,791
Cost of Sales
Cost of goods and services sold	$ 16,117	$ 15,365	$ 32,826	$ 31,105