Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Cash flows from operating activities:
Net income including noncontrolling interests	$ 117,917	$ 83,853	$ 39,228
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	45,756	45,588	44,201
Equity in income of unconsolidated joint ventures	(4,699)	(1,652)	(5,131)
Distributions of earnings from unconsolidated joint ventures	4,052	2,796	5,252
Stock-based compensation	13,450	12,964	10,926
Excess tax benefits from stock-based compensation	0	(918)	(172)
Deferred income taxes	(9,957)	6,051	8,412
Provision (recovery) for doubtful accounts	2,847	8,082	(1,034)
Impairment of goodwill and other intangible assets	0	0	60,763
Fair value adjustments to contingent consideration	(6,923)	2,823	(3,113)
Lease termination costs and related asset impairment	0	2,946	342
Gain on disposal of property and equipment	(103)	(537)	(6,014)
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(64,781)	9,062	40,345
Prepaid expenses and other assets	(8,317)	3,720	12,970
Accounts payable	18,597	(3,002)	(26,901)
Accrued compensation	13,413	8,434	(7,676)
Billings in excess of costs on uncompleted contracts	28,298	(13,874)	(10,319)
Other liabilities	2,167	(19,321)	(7,143)
Income taxes receivable/payable	(13,725)	(4,995)	7,911
Net cash provided by operating activities	137,992	142,020	162,847
Cash flows from investing activities:
Capital expenditures	(9,741)	(11,945)	(24,296)
Payments for business acquisitions, net of cash acquired	(8,039)	(81,259)	(11,680)
Changes in restricted cash	0	(2,519)	4,530
Proceeds from sale of property and equipment	905	3,076	10,426
Investments in unconsolidated joint ventures	(85)	(1,368)	0
Net cash used in investing activities	(16,960)	(94,015)	(21,020)
Cash flows from financing activities:
Payments on long-term debt	(233,865)	(148,485)	(75,459)
Proceeds from borrowings	243,553	229,049	64,794
Payments of contingent earn-out liabilities	(1,319)	(3,251)	(3,199)
Debt pre-payment costs	0	(1,935)	(1,457)
Distributions paid to noncontrolling interests	(24)	(402)	(515)
Excess tax benefits from stock-based compensation	0	918	172
Repurchases of common stock	(100,000)	(99,500)	(100,500)
Net proceeds from issuance of common stock	18,555	17,953	10,825
Dividends paid	(21,672)	(19,735)	(18,240)
Net cash used in financing activities	(94,772)	(25,388)	(123,579)
Effect of foreign exchange rate changes on cash	3,256	2,516	(5,301)
Net increase in cash and cash equivalents	29,516	25,133	12,947
Cash and cash equivalents at beginning of year	160,459	135,326	122,379
Cash and cash equivalents at end of year	189,975	160,459	135,326
Cash paid during the year for:
Interest	11,504	12,575	7,323
Income taxes, net of refunds of $2.1 million, $3.2 million and $5.4 million	$ 72,578	$ 35,273	$ 23,268