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Business Acquisitions, Goodwill and Intangible Assets (Details 2) $ in Thousands	6 Months Ended
	Mar. 31, 2016 USD ($)
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$ 5,820,692
Post-Acquisition Adjustments	(29,000)
Foreign Exchange Impact	5,200
Disposed	(11,300)
Goodwill at the end of the period	5,785,619
Design and Consulting Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	3,163,300
Post-Acquisition Adjustments	(10,400)
Foreign Exchange Impact	12,900
Goodwill at the end of the period	3,165,800
Construction Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	918,500
Post-Acquisition Adjustments	(18,600)
Foreign Exchange Impact	1,600
Disposed	(11,300)
Goodwill at the end of the period	890,200
Management Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	1,738,900
Foreign Exchange Impact	(9,300)
Goodwill at the end of the period	$ 1,729,600

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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