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Subsequent Event (Details) (USD $)	12 Months Ended						0 Months Ended		0 Months Ended				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Oct. 17, 2014 Subsequent Event [Member] Line of Credit [Member]	Oct. 17, 2014 Subsequent Event [Member] Revolving Credit Facility [Member]	Oct. 17, 2014 Subsequent Event [Member] Letter of Credit [Member]	Oct. 17, 2014 Subsequent Event [Member] URS Corporation	Oct. 17, 2014 Subsequent Event [Member] URS Corporation	Oct. 17, 2014 Subsequent Event [Member] Senior Notes [Member] URS Corporation	Oct. 17, 2014 Subsequent Event [Member] Senior Notes [Member] URS Corporation	Oct. 17, 2014 Subsequent Event [Member] Term Loan A Member Secured Debt [Member]	Oct. 17, 2014 Subsequent Event [Member] Term Loan B Member Secured Debt [Member]	Sep. 30, 2014 Subsequent Event [Member] Senior Notes 5.43% series A due July 2020 and senior discount notes 1.00% series B due July 2022	Oct. 17, 2014 Subsequent Event [Member] Senior Notes 5.43% series A due July 2020 and senior discount notes 1.00% series B due July 2022	Oct. 17, 2014 Subsequent Event [Member] Senior Notes 5.43% Series A Due July 2020	Oct. 17, 2014 Subsequent Event [Member] Senior Discount Notes 1.00% Series B due July 2022
Subsequent event
Percentage of ownership acquired								100.00%
Consideration paid in cash	$ 70,200,000	$ 62,100,000	$ 14,500,000				$ 2,300,000,000
Consideration paid by issuing stock		14,300,000	900,000				1,600,000,000
Senior notes assumed in acquisition as part of consideration	18,300,000	5,600,000					1,000,000,000
Repayment of acquiree term loan as part of consideration							600,000,000
Repayment of acquiree line of credit as part of consideration							100,000,000
Percentage price of original principal amount of note at which note can be redeemed									101.00%
Amount of notes purchased										600,000,000
Borrowing capacity					1,050,000,000	500,000,000					1,925,000,000	760,000,000
Maximum increase in borrowing capacity				500,000,000
Repayment of indebtedness	1,998,882,000	2,156,399,000	1,550,996,000										300,000,000
Prepayment of accrued interest and prepayment penalty														$ 56,000,000
Interest rate (as a percent)															5.43%	1.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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