Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income including noncontrolling interests	$ 59,236	$ 51,268
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	29,414	29,322
Loss on settlement of foreign currency forward contract		270
Equity in earnings of unconsolidated joint ventures	(1,492)	(1,929)
Distributions of earnings from unconsolidated joint ventures	1,064	1,549
Stock-based compensation	5,537	4,840
Excess tax benefits from stock-based compensation	(677)	(866)
Deferred income taxes	(2,658)	4,880
Provision for doubtful accounts	3,634	2,164
Fair value adjustments to contingent consideration	(25,973)	(946)
Loss (gain) on disposal of property and equipment	717	(237)
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable	5,550	75,183
Prepaid expenses and other assets	(4,101)	(4,139)
Accounts payable	9,517	(31,180)
Accrued compensation	(21,403)	(33,220)
Billings in excess of costs on uncompleted contracts	6,460	(15,732)
Other liabilities	(15,831)	(6,208)
Income taxes receivable/payable	7,212	(13,001)
Net cash provided by operating activities	56,206	62,018
Cash flows from investing activities:
Capital expenditures	(11,699)	(13,634)
Payments for business acquisitions, net of cash acquired	(10,286)	(168,092)
Payment in settlement of foreign currency forward contract		(4,177)
Receipt in settlement of foreign currency forward contract		3,907
Changes in restricted cash		470
Payment received on note for sale of operation	3,900
Proceeds from sale of property and equipment	2,957	962
Net cash used in investing activities	(15,128)	(180,564)
Cash flows from financing activities:
Payments on long-term debt	(459)	(113,978)
Proceeds from borrowings		296,098
Payments of earn-out liabilities	(9,337)	(24,015)
Net change in overdrafts	(915)	291
Excess tax benefits from stock-based compensation	677	866
Repurchases of common stock	(6,612)
Net proceeds from issuance of common stock	17,529	14,561
Net cash provided by financing activities	883	173,823
Effect of foreign exchange rate changes on cash	(4,041)	(550)
Net increase in cash and cash equivalents	37,920	54,727
Cash and cash equivalents at beginning of period	129,305	104,848
Cash and cash equivalents at end of period	167,225	159,575
Cash paid during the period for:
Interest	4,404	2,494
Income taxes, net of refunds received	$ 19,973	$ 31,531