Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
Cash flows from operating activities:
Net income including noncontrolling interests	$ 26,978	$ 44,656
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	21,410	23,948
Equity in income of unconsolidated joint ventures	(896)	(1,842)
Distributions of earnings from unconsolidated joint ventures	1,334	1,694
Stock-based compensation	6,147	5,391
Excess tax benefits from stock-based compensation	(211)	(165)
Deferred income taxes	7,109	1,460
Provision for doubtful accounts	8,047	(1,411)
Fair value adjustments to contingent consideration	2,823	(3,113)
Gain on disposal of property and equipment	(359)	(6,175)
Lease termination costs and related asset impairment	2,946
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable	35,898	37,289
Prepaid expenses and other assets	(8,694)	6,289
Accounts payable	(27,176)	(39,634)
Accrued compensation	(23,038)	(20,763)
Billings in excess of costs on uncompleted contracts	(9,646)	(8,073)
Other liabilities	3,330	(20,279)
Income taxes receivable/payable	(15,760)	5,494
Net cash provided by operating activities	30,242	24,766
Cash flows from investing activities:
Capital expenditures	(6,007)	(12,096)
Payments for business acquisitions, net of cash acquired	(81,256)
Changes in restricted cash	(3,384)
Proceeds from sale of property and equipment	969	9,824
Investments in unconsolidated joint ventures	(613)
Net cash used in investing activities	(90,291)	(2,272)
Cash flows from financing activities:
Payments on long-term debt	(76,717)	(24,001)
Proceeds from borrowings	170,000	59,095
Payments of earn-out liabilities	(1,001)	(3,199)
Debt pre-payment costs	(1,935)
Excess tax benefits from stock-based compensation	211	165
Repurchases of common stock	(50,000)	(68,735)
Dividends paid	(9,382)	(8,630)
Net proceeds from issuance of common stock	6,235	4,316
Net cash provided by (used in) financing activities	37,411	(40,989)
Effect of foreign exchange rate changes on cash	979	(5,366)
Net decrease in cash and cash equivalents	(21,659)	(23,861)
Cash and cash equivalents at beginning of period	135,326	122,379
Cash and cash equivalents at end of period	113,667	98,518
Cash paid during the period for:
Interest	7,120	3,604
Income taxes, net of refunds received of $2.1 million and $1.2 million	$ 19,855	$ 11,599