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Business Acquisitions, Goodwill and Intangible Assets (Details 2)
$ in Thousands
 9 Months Ended
Jun. 30, 2015
USD ($)
Changes in the carrying value of goodwill by reporting segment  
Goodwill at the beginning of the period $ 1,937,338
Acquired 3,959,900
Post-Acquisition Adjustments 19,200
Foreign Exchange Impact 112,400
Goodwill at the end of the period 5,803,966
Design and Consulting Services  
Changes in the carrying value of goodwill by reporting segment  
Goodwill at the beginning of the period 1,479,200
Acquired 1,805,100
Post-Acquisition Adjustments 5,500
Foreign Exchange Impact 67,600
Goodwill at the end of the period 3,222,200
Construction Services  
Changes in the carrying value of goodwill by reporting segment  
Goodwill at the beginning of the period 276,900
Acquired 393,000
Post-Acquisition Adjustments 13,700
Foreign Exchange Impact 25,800
Goodwill at the end of the period 657,800
Management Services  
Changes in the carrying value of goodwill by reporting segment  
Goodwill at the beginning of the period 181,200
Acquired 1,761,800
Foreign Exchange Impact 19,000
Goodwill at the end of the period $ 1,924,000