Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Cash Flows from Operating Activities
Net income	$ 43,067	$ 61,328	$ 25,084
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock-based compensation	9,397	7,283	5,600
Fair value adjustment to acquired inventory	1,601	0	7,975
Net periodic pension benefit cost	1,154	1,178	1,768
Depreciation and amortization	37,975	34,492	35,523
(Gain) loss on sale or disposal of property and equipment	1,442	(4,162)	733
Amortization of debt issuance costs	6,765	4,644	3,863
Loss on debt extinguishment	0	0	503
Deferred income taxes	(11,060)	(28,252)	(9,127)
Bad debt provision (recovery), net	1,744	2,271	1,930
Other	(671)	(111)	0
Changes in operating assets and liabilities
Accounts receivable and unbilled accounts receivable	(21,340)	4,763	7,652
Inventories, net	8,702	(12,343)	(2,253)
Prepaid expenses	(3,194)	(375)	(1,486)
Accounts payable	(4,624)	(846)	1,751
Accrued payroll and related costs	2,917	(5,338)	4,781
Advance payments from customers	(23,041)	3,531	3,635
Accrued warranty costs	(1,861)	(594)	278
Other assets and liabilities	24,490	(4,222)	(16,350)
Net Cash Provided by (Used in) Operating Activities	73,463	63,247	71,860
Cash Flows from Investing Activities
Purchases of property and equipment	(30,525)	(12,321)	(17,798)
Proceeds from sale of property and equipment	10	6,793	45
Purchases of business, net of acquired cash	(151,956)	0	(853)
Other	(285)	823	0
Net Cash Provided by (Used in) Investing Activities	(182,756)	(4,705)	(18,606)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	430,391	0	0
Payment of long-term debt	(298,659)	(64,517)	(4,881)
Payment of debt component of tangible equity units	(7,290)	(9,153)	(8,541)
Payment of debt issuance costs for long-term debt	(6,561)	0	(782)
Payment of debt issuance costs for revolving credit facility	(667)	(125)	(200)
Receipts under short-term borrowings	70,000	38,750	0
Payments under short-term borrowings	(70,000)	(38,750)	0
Cash dividends	(21,713)	(21,360)	(20,079)
Proceeds from exercise of stock options and employee stock purchase plan	3,435	1,992	5,579
Payments to purchase and retire common stock	(1,533)	(1,403)	(1,785)
Net Cash Provided by (Used in) Financing Activities	97,403	(94,566)	(30,689)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1,977)	(905)	1,388
Cash and Cash Equivalents
Increase (decrease) during the period	(13,867)	(36,929)	23,953
Balance, beginning of period	71,804	108,733	84,780
Balance, End of Period	57,937	71,804	108,733
Cash paid during the year for
Interest	22,136	22,224	29,881
Income taxes	11,406	11,380	11,478
Non-cash investing and financing activities
Property and equipment acquired under capital lease	0	67	2,747
Dividends declared not yet paid	$ 5,695	$ 5,312	$ 5,278