Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Cash Flows from Operating Activities
Net income	$ 25,084	$ 27,494	$ 45,462
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock-based compensation	5,600	7,224	7,351
Excess tax benefits from stock-based compensation	(208)	(187)	(771)
Fair value adjustment to acquired inventory	7,975	7,916	0
Net periodic pension benefit cost	1,768	1,136	986
Depreciation and amortization	35,523	24,077	21,106
Amortization of debt issuance costs	3,863	1,054	162
Loss on debt extinguishment	503	502	0
Deferred income taxes	(9,127)	(5,274)	459
Bad debt provision (recovery), net	1,930	957	1,210
Changes in operating assets and liabilities
Accounts receivable and unbilled accounts receivable	7,652	(22,059)	3,308
Inventories, net	(2,253)	3,365	(4,105)
Prepaid expenses	(1,486)	(1,086)	(1,673)
Accounts payable	1,751	5,647	6,772
Accrued payroll and related costs	4,781	9,057	(835)
Advance payments from customers	3,635	5,701	13,065
Accrued warranty costs	278	414	445
Other assets and liabilities	(15,617)	1,943	7,494
Net Cash Provided by (Used in) Operating Activities	71,652	67,881	100,436
Cash Flows from Investing Activities
Purchases of property and equipment	(17,798)	(20,806)	(18,445)
Proceeds from sale of property and equipment	45	1,514	0
Purchases of business, net of acquired cash	(853)	(580,920)	(667)
Net Cash Provided by (Used in) Investing Activities	(18,606)	(600,212)	(19,112)
Cash Flows from Financing Activities
Payment of long-term debt	(4,881)	0	0
Proceeds from issuance of long-term debt	0	460,000	0
Proceeds from issuance of common stock, net of issuance costs	0	74,301	0
Proceeds from issuance of equity component of tangible equity units, net of issuance costs	0	84,511	0
Payment for capped calls	0	(7,935)	0
Proceeds from issuance of debt component of tangible equity units	0	27,386	0
Payment of debt component of tangible equity units	(8,541)	(2,401)	0
Payment of debt issuance costs for long-term debt	(782)	(19,837)	0
Payment of debt issuance costs for debt component of tangible equity units	0	(971)	0
Payment of debt issuance costs for revolving credit facility	(200)	(920)	(26)
Receipts under short-term borrowings	0	20,000	11,183
Payments under short-term borrowings	0	(41,343)	(50,000)
Excess tax benefits from stock-based compensation	208	187	771
Cash dividends	(20,079)	(13,932)	(22,445)
Proceeds from exercise of stock options and employee stock purchase plan	5,579	3,847	4,847
Payments to purchase and retire common stock	(1,785)	(18,414)	(29,115)
Net Cash Provided by (Used in) Financing Activities	(30,481)	564,479	(84,785)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	1,388	864	(5,168)
Cash and Cash Equivalents
Increase (decrease) during the year	23,953	33,012	(8,629)
Balance, beginning of period	84,780	51,768	60,397
Balance, End of Period	108,733	84,780	51,768
Cash paid during the year for
Interest	29,881	1,225	816
Income taxes	11,478	10,826	10,199
Non-cash investing and financing activities
Deferred endowment consideration not yet paid	0	1,000	0
Net working capital adjustment not yet received	0	513	0
Property and equipment acquired under capital lease	2,747	0	0
Dividends declared not yet paid	5,278	4,942	0
Debt issuance costs not yet paid recorded in accounts payable and other accrued liabilities	$ 0	$ 235	$ 0