Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (97,463)us-gaap_ProfitLoss	$ 99,037us-gaap_ProfitLoss
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	316,444	46,142
Equity in earnings of unconsolidated joint ventures	(48,552)	(43,519)
Distribution of earnings from unconsolidated joint ventures	73,368	14,720
Non-cash stock compensation	51,564us-gaap_ShareBasedCompensation	21,187us-gaap_ShareBasedCompensation
Prepayment penalty on unsecured senior notes	55,639
Excess tax benefit from share-based payment	(2,560)	(564)
Foreign currency translation	(32,574)	(7,614)
Write-off of debt issuance costs	8,997
Other	(386)us-gaap_OtherNoncashExpense	3,022us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	444,742us-gaap_IncreaseDecreaseInReceivables	66,898us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other assets	(74,858)	(5,047)
Accounts payable	(76,948)	17,196
Accrued expenses and other current liabilities	(164,899)	(96,802)
Billings in excess of costs on uncompleted contracts	(80,146)	2,464
Other long-term liabilities	(39,766)	(4,568)
Income taxes payable		(6,556)
Net cash provided by operating activities	332,602	105,996
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisitions, net of cash acquired	(3,279,239)	(659)
Cash acquired from consolidation of joint venture		18,955
Net investment in unconsolidated joint ventures	(14,759)	(40,322)
Proceeds from sale of investments	574	1,381
Payments for capital expenditures, net of disposals	(55,587)	(33,167)
Net cash used in investing activities	(3,349,011)	(53,812)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	4,765,528us-gaap_ProceedsFromIssuanceOfDebt	1,041,269us-gaap_ProceedsFromIssuanceOfDebt
Repayments of borrowings under credit agreements	(3,075,118)us-gaap_RepaymentsOfDebt	(1,113,937)us-gaap_RepaymentsOfDebt
Issuance of unsecured senior notes	1,600,000
Net change in overdrafts	(19,160)	(25,272)
Prepayment penalty on unsecured senior notes	(55,639)
Cash paid for debt and equity issuance costs	(87,098)us-gaap_PaymentsOfStockIssuanceCosts	(2,563)us-gaap_PaymentsOfStockIssuanceCosts
Proceeds from issuance of common stock	8,713	7,937
Proceeds from exercise of stock options	4,474	5,945
Payments to repurchase common stock	(11,535)	(34,179)
Excess tax benefit from share-based payment	2,560	564
Net distributions to noncontrolling interests	(58,875)	(24,632)
Net cash provided by (used in) financing activities	3,073,850	(144,868)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(19,032)	(5,450)
NET INCREASE(DECREASE) IN CASH AND CASH EQUIVALENTS	38,409	(98,134)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	574,188	600,677
CASH AND CASH EQUIVALENTS AT END OF PERIOD	612,597	502,543
NON-CASH INVESTING AND FINANCING ACTIVITY
Common stock issued in acquisitions	1,554,912us-gaap_StockIssued1
Debt assumed from acquisitions	$ 567,656

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- Definition

Amount of cash inflow (outflow) from (to) a noncontrolling interest. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The fair value of stock issued in noncash financing activities.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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