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Business Acquisitions, Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands | 9 Months Ended
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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

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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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