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Business Acquisitions, Goodwill and Intangible Assets (Details 2)
$ in Thousands
 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
item
Sep. 30, 2011
USD ($)
Goodwill        
Number of reporting units | item     2  
Goodwill impairment     $ (336,000)  
Goodwill Impairment, net of tax     317,200  
Goodwill $ 1,811,754 $ 1,811,754 1,775,400 $ 1,775,400
Changes in the carrying value of goodwill by reporting segment        
Goodwill at the beginning of the period 1,811,754   1,775,400  
Post-Acquisition Adjustments 5,000      
Foreign Exchange Impact (31,300) (36,200)    
Acquired 151,800 72,600    
Goodwill impairment     $ (336,000)  
Goodwill at the end of the period 1,937,338 1,811,754   $ 1,775,400
EMEA [Member]        
Goodwill        
Market multiple of revenue     0.35 0.50
Carrying value before impairment     $ 345,500  
Goodwill impairment     (155,000)  
Carrying value after impairment     190,500  
Changes in the carrying value of goodwill by reporting segment        
Goodwill impairment     (155,000)  
Unconsolidated Joint Ventures        
Goodwill        
Goodwill 79,100      
Changes in the carrying value of goodwill by reporting segment        
Goodwill at the end of the period 79,100      
Design and Consulting Services        
Goodwill        
Goodwill impairment     (155,000)  
Goodwill 1,414,100 1,414,100 1,377,700 $ 1,377,700
Changes in the carrying value of goodwill by reporting segment        
Goodwill at the beginning of the period 1,414,100   1,377,700  
Post-Acquisition Adjustments 5,000      
Foreign Exchange Impact (31,300) (36,200)    
Acquired 91,400 72,600    
Goodwill impairment     $ (155,000)  
Goodwill at the end of the period 1,479,200 1,414,100   $ 1,377,700
Construction Services        
Goodwill        
Goodwill 216,500 216,500    
Changes in the carrying value of goodwill by reporting segment        
Goodwill at the beginning of the period 216,500      
Acquired 60,400      
Goodwill at the end of the period 276,900 216,500    
Management Services        
Goodwill        
Market multiple of revenue     0.35 0.50
Carrying value before impairment     $ 362,200  
Goodwill impairment     (181,000)  
Carrying value after impairment     181,200  
Goodwill 181,200 181,200 181,200 $ 181,200
Changes in the carrying value of goodwill by reporting segment        
Goodwill at the beginning of the period 181,200   181,200  
Goodwill impairment     $ (181,000)  
Goodwill at the end of the period $ 181,200 $ 181,200   $ 181,200