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Represents the average effective interest rate during the period, net of the impact of the interest rate swaps.

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No definition available.

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Represents the maximum amount of increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Represents the prepayment penalty on unsecured senior notes.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Fair value amount of debt instrument that was repurchased.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Debt (Details) (USD $)	6 Months Ended		0 Months Ended
Debt (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Oct. 17, 2014	Oct. 24, 2014	Sep. 30, 2014	Oct. 06, 2014
Debt
Total debt	$ 4,867,900,000us-gaap_DebtAndCapitalLeaseObligations				$ 1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Less: Current portion of debt and short-term borrowings	(176,300,000)us-gaap_DebtCurrent				(64,400,000)us-gaap_DebtCurrent
Long-term debt, less current portion	4,691,571,000				939,565,000
Scheduled maturities of debt:
2015 (six months remaining)	98,700,000
2016	155,800,000
2017	329,400,000
2018	124,000,000
2019	86,900,000
Thereafter	4,073,100,000
Total debt	4,867,900,000us-gaap_DebtAndCapitalLeaseObligations				1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Debt agreements
Repayment of indebtedness	3,075,118,000us-gaap_RepaymentsOfDebt	1,113,937,000us-gaap_RepaymentsOfDebt
Prepayment Penalty On Unsecured Senior Notes	55,639,000
Debt	4,867,900,000us-gaap_DebtAndCapitalLeaseObligations				1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Actual net worth of the entity	3,429,567,000us-gaap_StockholdersEquity				2,186,517,000us-gaap_StockholdersEquity
Average effective interest rate on total borrowings, including the effects of swaps (as a percent)	4.10%	2.80%
Line of Credit
Debt agreements
Consolidated leverage ratio	4.4
Outstanding letters of credit	98,300,000				12,100,000
Remaining borrowing capacity under the credit facility	951,700,000				1,037,900,000
Maximum increase in borrowing capacity			500,000,000
Secured Debt
Debt
Total debt	2,655,200,000
Scheduled maturities of debt:
Total debt	2,655,200,000
Debt agreements
Debt	2,655,200,000
Revolving Credit Facility
Debt agreements
Borrowing capacity			1,050,000,000
Letter of Credit
Debt agreements
Borrowing capacity			500,000,000
URS Corporation
Debt agreements
Senior notes assumed in acquisition as part of consideration			1,000,000,000
Notes Payable to Banks
Debt
Total debt					712,500,000
Scheduled maturities of debt:
Total debt					712,500,000
Debt agreements
Debt					712,500,000
Senior Notes
Debt
Total debt					263,900,000
Scheduled maturities of debt:
Total debt					263,900,000
Debt agreements
Debt					263,900,000
Fair value of debt instrument	1,674,000,000
Senior Notes \| URS Corporation
Debt
Total debt	430,200,000			1,000,000,000
Scheduled maturities of debt:
Total debt	430,200,000			1,000,000,000
Debt agreements
Debt	430,200,000			1,000,000,000
Redemption price percentage			101.00%	101.00%
Amount of notes purchased			600,000,000	572,300,000
Fair value of long term debt	414,500,000
Senior Notes 5.00 Percent Due 2022 \| URS Corporation
Debt agreements
Interest rate (as a percent)				5.00%
Senior Notes 3.85 Percent Due 2017 \| URS Corporation
Debt agreements
Interest rate (as a percent)				3.85%
Senior Notes 5.43 Percent Series A Due July 2020
Debt agreements
Interest rate (as a percent)			5.43%
Senior Discount Notes 1.00 Percent Series B Due July 2022
Debt agreements
Interest rate (as a percent)			1.00%
Other Debt
Debt
Total debt	182,500,000				27,600,000
Scheduled maturities of debt:
Total debt	182,500,000				27,600,000
Debt agreements
Debt	182,500,000				27,600,000
Outstanding letters of credit	341,000,000				301,000,000
Unsecured Credit Facilities
Debt agreements
Remaining borrowing capacity under the credit facility	428,000,000
Term Loan A
Debt agreements
Borrowing capacity			1,925,000,000
Term Loan B
Debt agreements
Borrowing capacity			760,000,000
Notes
Debt
Total debt	1,600,000,000
Scheduled maturities of debt:
Total debt	1,600,000,000
Debt agreements
Debt	1,600,000,000
The 2022 Notes
Debt agreements
Principal amount						800,000,000
Interest rate (as a percent)						5.75%
The 2024 Notes
Debt agreements
Principal amount						$ 800,000,000
Interest rate (as a percent)						5.875%