Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended	25 Months Ended
	Sep. 30, 2011 In Arbitration Litigation [Member] Clark County Nevada Against Jacobs Engineering Group, Inc. [Member]	Sep. 28, 2012 In Arbitration Litigation [Member] Clark County Nevada Against Jacobs Engineering Group, Inc. [Member] arbitrator	Jan. 20, 2010 In Arbitration Litigation [Member] Clark County Nevada Against Jacobs Engineering Group, Inc. [Member] subsidiary	Dec. 28, 2012 Carter and Burgess Inc [Member] Carter and Burgess, Inc. Against City Of Victorville [Member]	Dec. 28, 2012 Carter and Burgess Inc [Member] In Appeal Litigation [Member] Carter and Burgess, Inc. Against City Of Victorville [Member]	Dec. 31, 2010 Carter and Burgess Inc [Member] In Appeal Litigation [Member] Carter and Burgess, Inc. Against City Of Victorville [Member]	Apr. 30, 2008 Carter and Burgess Inc [Member] In Appeal Litigation [Member] Carter and Burgess, Inc. Against City Of Victorville [Member] subsidiary
Loss Contingencies [Line Items]
Number of subsidiaries			2				1
Verdict amount In appeal						$ 52
Interest rate accrued on litigation judgement					10.00%
Litigation settlement, amount				54
Third party payment of litigation settlement and awards	$ 60
Number of abitrators		3