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Business Acquisitions, Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Goodwill    
Maximum period to determine final value of identifiable intangible assets 12 months  
Changes in the carrying value of goodwill by reporting segment    
Goodwill at the beginning of the period $ 5,820,692 $ 1,937,300
Post-Acquisition Adjustments 39,400 6,100
Foreign Exchange Impact (25,000) (168,100)
Disposed (11,300)  
Acquired   4,045,400
Goodwill at the end of the period 5,823,843 5,820,692
Design and Consulting Services    
Changes in the carrying value of goodwill by reporting segment    
Goodwill at the beginning of the period 3,163,300 1,479,200
Post-Acquisition Adjustments 26,700 5,500
Foreign Exchange Impact 8,200 (96,000)
Acquired   1,774,600
Goodwill at the end of the period 3,198,200 3,163,300
Construction Services    
Changes in the carrying value of goodwill by reporting segment    
Goodwill at the beginning of the period 918,500 276,900
Post-Acquisition Adjustments 8,700 600
Foreign Exchange Impact (700) (34,000)
Disposed (11,300)  
Acquired   675,000
Goodwill at the end of the period 915,200 918,500
Management Services    
Changes in the carrying value of goodwill by reporting segment    
Goodwill at the beginning of the period 1,738,900 181,200
Post-Acquisition Adjustments 4,000  
Foreign Exchange Impact (32,500) (38,100)
Acquired   1,595,800
Goodwill at the end of the period $ 1,710,400 $ 1,738,900