Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (80,330)us-gaap_ProfitLoss	$ 56,541us-gaap_ProfitLoss
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	102,122	22,198
Equity in earnings of unconsolidated joint ventures	(23,924)	(36,083)
Distribution of earnings from unconsolidated joint ventures	42,213	9,170
Non-cash stock compensation	36,017us-gaap_ShareBasedCompensation	10,941us-gaap_ShareBasedCompensation
Prepayment penalty on unsecured senior notes	55,639
Excess tax benefit from share-based payment	(2,526)	(448)
Foreign currency translation	(14,546)	(9,466)
Write-off of debt issuance costs	8,997
Other noncash	2,060us-gaap_OtherNoncashExpense	1,185us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	349,148us-gaap_IncreaseDecreaseInReceivables	1,709us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other assets	31,172	19,733
Accounts payable	(58,274)	72,436
Accrued expenses and other current liabilities	(163,801)	(16,873)
Billings in excess of costs on uncompleted contracts	10,932	21,241
Other long-term liabilities	(12,257)	(8,226)
Income taxes payable		(6,671)
Net cash provided by operating activities	282,642	137,387
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisitions, net of cash acquired	(3,277,111)	(659)
Cash acquired from consolidation of joint venture		18,955
Net investment in unconsolidated joint ventures	(9,127)	(519)
Purchases of investments	(8,056)	(17,555)
Proceeds from disposal of property and equipment	4,663
Payments for capital expenditures	(29,733)	(20,771)
Net cash used in investing activities	(3,319,364)	(20,549)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	3,858,648us-gaap_ProceedsFromIssuanceOfDebt	501,927us-gaap_ProceedsFromIssuanceOfDebt
Repayments of borrowings under credit agreements	(2,053,648)us-gaap_RepaymentsOfDebt	(476,013)us-gaap_RepaymentsOfDebt
Issuance of unsecured senior notes	1,600,000
Net change in overdrafts	(19,961)	(9,980)
Prepayment penalty on unsecured senior notes	(55,639)
Cash paid for equity issuance costs	(86,249)us-gaap_PaymentsOfStockIssuanceCosts
Proceeds from issuance of common stock	3,645	1,803
Proceeds from exercise of stock options	2,383	1,637
Payments to repurchase common stock	(10,957)	(33,721)
Excess tax benefit from share-based payment	2,526	448
Net distributions to noncontrolling interests	(34,674)	(19,368)
Net cash used in financing activities	3,206,074	(33,267)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(8,892)	(2,505)
NET INCREASE IN CASH AND CASH EQUIVALENTS	160,460	81,066
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	574,188	600,677
CASH AND CASH EQUIVALENTS AT END OF YEAR	734,648	681,743
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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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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Name:	us-gaap_ProceedsFromPaymentsToMinorityShareholders
Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-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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Name:	us-gaap_ProceedsFromStockOptionsExercised
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-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

+ Details

Name:	us-gaap_ProfitLoss
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Balance Type:	credit
Period Type:	duration

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fair value of stock issued in noncash financing activities.

+ References

+ Details

Name:	us-gaap_StockIssued1
Namespace Prefix:	us-gaap_
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

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration