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Business Acquisitions, Goodwill and Intangible Assets (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
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