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Commitments and Contingencies (Details) CAD in Millions, AUD in Millions				1 Months Ended			12 Months Ended
	Dec. 06, 2014 USD ($)	Oct. 17, 2014 USD ($) project item	Jun. 17, 2014 AUD	Aug. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 31, 2010 CAD	Sep. 30, 2015 USD ($) employee item	Sep. 30, 2006 AUD	Oct. 24, 2014 USD ($)
Commitments and Contingencies
Securities acquired by investors | AUD			AUD 155
URS Energy & Construction
Commitments and Contingencies
Damages claimed by applicants				$ 4,100,000
Number of former employees who filed claims against our affiliate | employee							2
URS Corporation
Commitments and Contingencies
Bank loan									$ 5.00
Standby Letters of Credit
Commitments and Contingencies
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees							$ 436,500,000
USAID Egyptian Projects | URS Corporation | Washington Group International
Commitments and Contingencies
Number of subcontractors | item		2
Number of projects failed to comply USAID regulations | project		5
Amount paid to WGI from the federal government for completed and operational projects ( including doubling and trebling of damages)		$ 373,000,000
DOE Deactivation Demolition And Removal Project Member | URS Corporation | Washington Group International
Commitments and Contingencies
Projects costs, minimum							146,000,000
DOE Deactivation Demolition And Removal Project Member | Department of Energy Member
Commitments and Contingencies
Projects costs, minimum							106,000,000
DOE Deactivation Demolition And Removal Project Member | Department of Energy Member | URS Corporation | Washington Group International
Commitments and Contingencies
Projects costs, minimum							106,000,000
Projects costs, maximum							$ 146,000,000
Amount recovery ( including additional Fees)					$ 103,000,000
Minimum cost to complete the project and promised amenities					$ 100,000,000
Canadian Pipeline Contract Member | URS Corporation | Flint Energy Services Ltd
Commitments and Contingencies
Damages claimed by applicants | CAD						CAD 85
Waste Isolation Pilot Plant Environmental Incidents Member | URS Corporation | Nuclear Waste Partnership LLC
Commitments and Contingencies
Civil penalty Amount	$ 17,700,000
AECOM Australia
Commitments and Contingencies
Proceeds from initial public offering (IPO) | AUD								AUD 700
Bank loan | AUD								AUD 1,400
Number of initial public offering investors | item							770

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