Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Cash Flows from Operating Activities
Net income	$ 61,328	$ 25,084	$ 27,494
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock-based compensation	7,283	5,600	7,224
Fair value adjustment to acquired inventory	0	7,975	7,916
Net periodic pension benefit cost	1,178	1,768	1,136
Depreciation and amortization	34,492	35,523	24,077
(Gain) loss on sale or disposal of property and equipment	(4,162)	733	1,069
Amortization of debt issuance costs	4,644	3,863	1,054
Loss on debt extinguishment	0	503	502
Deferred income taxes	(28,252)	(9,127)	(5,274)
Bad debt provision (recovery), net	2,271	1,930	957
Other	(111)	0	0
Changes in operating assets and liabilities
Accounts receivable and unbilled accounts receivable	4,763	7,652	(22,059)
Inventories, net	(12,343)	(2,253)	3,365
Prepaid expenses	(375)	(1,486)	(1,086)
Accounts payable	(846)	1,751	5,647
Accrued payroll and related costs	(5,338)	4,781	9,057
Advance payments from customers	3,531	3,635	5,701
Accrued warranty costs	(594)	278	414
Other assets and liabilities	(4,222)	(16,350)	874
Net Cash Provided by (Used in) Operating Activities	63,247	71,860	68,068
Cash Flows from Investing Activities
Purchases of property and equipment	(12,321)	(17,798)	(20,806)
Proceeds from sale of property and equipment	6,793	45	1,514
Purchases of business, net of acquired cash	0	(853)	(580,920)
Other	823	0	0
Net Cash Provided by (Used in) Investing Activities	(4,705)	(18,606)	(600,212)
Cash Flows from Financing Activities
Payment of long-term debt	(64,517)	(4,881)	0
Proceeds from issuance of long-term debt	0	0	460,000
Proceeds from issuance of common stock, net of issuance costs	0	0	74,301
Proceeds from issuance of equity component of tangible equity units, net of issuance costs	0	0	84,511
Payment for capped calls	0	0	(7,935)
Proceeds from issuance of debt component of tangible equity units	0	0	27,386
Payment of debt component of tangible equity units	(9,153)	(8,541)	(2,401)
Payment of debt issuance costs for long-term debt	0	(782)	(19,837)
Payment of debt issuance costs for debt component of tangible equity units	0	0	(971)
Payment of debt issuance costs for revolving credit facility	(125)	(200)	(920)
Receipts under short-term borrowings	38,750	0	20,000
Payments under short-term borrowings	(38,750)	0	(41,343)
Cash dividends	(21,360)	(20,079)	(13,932)
Proceeds from exercise of stock options and employee stock purchase plan	1,992	5,579	3,847
Payments to purchase and retire common stock	(1,403)	(1,785)	(18,414)
Net Cash Provided by (Used in) Financing Activities	(94,566)	(30,689)	564,292
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(905)	1,388	864
Cash and Cash Equivalents
Increase (decrease) during the period	(36,929)	23,953	33,012
Balance, beginning of period	108,733	84,780	51,768
Balance, End of Period	71,804	108,733	84,780
Cash paid during the year for
Interest	22,224	29,881	1,225
Income taxes	11,380	11,478	10,826
Non-cash investing and financing activities
Deferred endowment consideration not yet paid	0	0	1,000
Net working capital adjustment not yet received	0	0	513
Property and equipment acquired under capital lease	67	2,747	0
Dividends declared not yet paid	5,312	5,278	4,942
Debt issuance costs not yet paid recorded in accounts payable and other accrued liabilities	$ 0	$ 0	$ 235