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Business Acquisitions, Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Jun. 30, 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	38,900
Foreign Exchange Impact	(16,900)
Disposed	(11,300)
Goodwill at the end of the period	5,831,409
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	26,700
Foreign Exchange Impact	5,700
Goodwill at the end of the period	3,195,700
Construction Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	918,500
Post-Acquisition Adjustments	8,200
Foreign Exchange Impact	3,100
Disposed	(11,300)
Goodwill at the end of the period	918,500
Management Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	1,738,900
Post-Acquisition Adjustments	4,000
Foreign Exchange Impact	(25,700)
Goodwill at the end of the period	$ 1,717,200

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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