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Business Acquisitions, Goodwill and Intangible Assets (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Changes in the carrying value of goodwill by reporting segment |  |
Goodwill at the beginning of the period | $ 1,937,338 | $ 1,811,800
Post-Acquisition Adjustments | 6,100 | 5,000
Foreign Exchange Impact | (168,100) | (31,300)
Acquired | 4,045,400 | 151,800
Goodwill at the end of the period | 5,820,692 | 1,937,338
Unconsolidated Joint Ventures |  |
Changes in the carrying value of goodwill by reporting segment |  |
Acquired |  | 79,100
Design and Consulting Services |  |
Changes in the carrying value of goodwill by reporting segment |  |
Goodwill at the beginning of the period | 1,479,200 | 1,414,100
Post-Acquisition Adjustments | 5,500 | 5,000
Foreign Exchange Impact | (96,000) | (31,300)
Acquired | 1,774,600 | 91,400
Goodwill at the end of the period | 3,163,300 | 1,479,200
Construction Services |  |
Changes in the carrying value of goodwill by reporting segment |  |
Goodwill at the beginning of the period | 276,900 | 216,500
Post-Acquisition Adjustments | 600 |
Foreign Exchange Impact | (34,000) |
Acquired | 675,000 | 60,400
Goodwill at the end of the period | 918,500 | 276,900
Management Services |  |
Changes in the carrying value of goodwill by reporting segment |  |
Goodwill at the beginning of the period | 181,200 | 181,200
Foreign Exchange Impact | (38,100) |
Acquired | 1,595,800 |
Goodwill at the end of the period | $ 1,738,900 | $ 181,200

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- 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 -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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