Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Cash Flows from Operating Activities
Net income (loss)	$ (272,051)	$ 43,067	$ 61,328
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock-based compensation	7,150	9,397	7,283
Fair value adjustment to acquired inventory	1,140	1,601	0
Impairment of assets	291,389	0	0
Net periodic pension benefit cost	1,876	1,154	1,178
Depreciation	23,843	20,614	20,661
Amortization	22,844	17,361	13,831
Accretion of contingent consideration	499	0	0
Contingent consideration fair value adjustment	8,092	0	0
(Gain) loss on sale or disposal of property and equipment	4,311	1,442	(4,162)
Amortization of debt issuance costs	3,197	6,765	4,644
Deferred income taxes	(17,175)	(11,060)	(28,252)
Bad debt provision (recovery), net	(1,184)	1,744	2,271
Other	0	(671)	(111)
Changes in operating assets and liabilities
Accounts receivable and unbilled accounts receivable	15,698	(21,340)	4,763
Inventories, net	(6,085)	8,702	(12,343)
Prepaid expenses	4,113	(3,194)	(375)
Accounts payable	(7,428)	(4,624)	(846)
Accrued payroll and related costs	(9,378)	2,917	(5,338)
Advance payments from customers	4,725	(23,041)	3,531
Accrued warranty costs	2,402	(1,861)	(594)
Other assets and liabilities	(30,129)	24,490	(4,222)
Net Cash Provided by (Used in) Operating Activities	47,849	73,463	63,247
Cash Flows from Investing Activities
Purchases of property and equipment	(23,893)	(30,525)	(12,321)
Proceeds from sale of property and equipment	948	10	6,793
Purchases of businesses, net of acquired cash	(49,361)	(151,956)	0
Other	87	(285)	823
Net Cash Provided by (Used in) Investing Activities	(72,219)	(182,756)	(4,705)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	58,576	430,391	0
Payment of long-term debt	(5,505)	(298,659)	(64,517)
Payment of debt component of tangible equity units	0	(7,290)	(9,153)
Payment of debt issuance costs for long-term debt	(88)	(6,561)	0
Payment of debt issuance costs for revolving credit facility	(1,344)	(667)	(125)
Receipts under short-term borrowings	150,000	70,000	38,750
Payments under short-term borrowings	(133,000)	(70,000)	(38,750)
Cash dividends	(17,205)	(21,713)	(21,360)
Proceeds from exercise of stock options and employee stock purchase plan	1,187	3,435	1,992
Payments to purchase and retire common stock	(1,208)	(1,533)	(1,403)
Net Cash Provided by (Used in) Financing Activities	51,413	97,403	(94,566)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	3,933	(1,977)	(905)
Cash and Cash Equivalents
Increase (decrease) during the period	30,976	(13,867)	(36,929)
Balance, beginning of period	57,937	71,804	108,733
Balance, End of Period	88,913	57,937	71,804
Cash paid during the year for
Interest	33,250	22,136	22,224
Income taxes	13,826	11,406	11,380
Non-cash investing and financing activities
Contingent consideration	26,497	0	0
Property and equipment acquired under capital lease	0	0	67
Dividends declared not yet paid	$ 0	$ 5,695	$ 5,312