Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Revenue
Product	$ 165,453	$ 170,800	$ 334,694	$ 347,395
Service	25,870	22,624	50,791	45,308
Total revenue	191,323	193,424	385,485	392,703
Cost of Sales
Product	101,133	101,605	201,627	214,383
Service	15,365	12,963	31,105	26,000
Total cost of sales	116,498	114,568	232,732	240,383
Gross profit	74,825	78,856	152,753	152,320
Operating expenses
Selling and marketing	30,597	30,627	62,625	61,097
General and administrative	18,992	23,556	39,554	47,579
Research and development	8,626	9,261	17,467	17,942
Total operating expenses	58,215	63,444	119,646	126,618
Income from operations	16,610	15,412	33,107	25,702
Interest expense, net	(6,708)	(7,418)	(13,512)	(14,698)
Other income (expense), net	274	666	51	(163)
Income before income taxes	10,176	8,660	19,646	10,841
Income tax provision (benefit)	1,738	1,461	(21,943)	1,937
Net income	$ 8,438	$ 7,199	$ 41,589	$ 8,904
Basic
Earnings per share (in dollars per share)	$ 0.44	$ 0.38	$ 2.17	$ 0.47
Weighted average common shares outstanding (in shares)	19,150	19,016	19,137	18,992
Diluted
Earnings per share (in dollars per share)	$ 0.44	$ 0.38	$ 2.16	$ 0.47
Weighted average common shares outstanding (in shares)	19,273	19,109	19,258	19,095
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60