Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Revenue
Revenue	$ 892,518	$ 778,032	$ 787,955
Cost of sales
Total cost of sales	563,588	472,503	485,677
Gross profit	328,930	305,529	302,278
Operating expenses
Selling and marketing	131,639	126,333	124,912
General and administrative	86,658	79,240	87,539
Research and development	30,928	34,784	34,999
Total operating expenses	249,225	240,357	247,450
Income from operations	79,705	65,172	54,828
Interest expense, net	(31,558)	(25,882)	(30,821)
Other income (expense), net	466	4,933	(996)
Income before income taxes	48,613	44,223	23,011
Income tax provision (benefit)	5,546	(17,105)	(2,073)
Net income	$ 43,067	$ 61,328	$ 25,084
Basic
Earnings per share (in dollars per share)	$ 2.24	$ 3.20	$ 1.32
Weighted average common shares outstanding (in shares)	19,258	19,163	19,040
Diluted
Earnings per share (in dollars per share)	$ 2.21	$ 3.18	$ 1.31
Weighted average dilutive common shares outstanding (in shares)	19,447	19,293	19,137
Dividends per share (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Product
Revenue
Revenue	$ 782,012	$ 674,391	$ 691,471
Cost of sales
Cost of goods and services sold	494,725	409,525	427,405
Service
Revenue
Revenue	110,506	103,641	96,484
Cost of sales
Cost of goods and services sold	$ 68,863	$ 62,978	$ 58,272