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Reportable Segments and Geographic Information - Segments (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Summarized financial information concerning the Company's reportable segments      
Number of reportable segments | segment 3    
Cost of revenue $ 4,188,376 $ 4,156,793  
Revenue 4,358,349 4,297,651  
Gross profit 169,973 140,858  
Equity in earnings of joint ventures 21,471 25,263  
General and administrative expenses (32,639) (28,639)  
Acquisition and integration expenses (15,412) (41,038)  
Loss on disposal activities   (41,053)  
Operating income (loss) 143,393 $ 55,391  
Segment assets $ 13,508,996   $ 13,669,936
Gross profit as a % of revenue 3.90% 3.30%  
Corporate      
Summarized financial information concerning the Company's reportable segments      
General and administrative expenses $ (32,600) $ (28,700)  
Acquisition and integration expenses (15,400) (41,000)  
Operating income (loss) (48,000) (69,700)  
Segment assets 714,900   765,300
Design and Consulting Services      
Summarized financial information concerning the Company's reportable segments      
Revenue 1,840,800 1,862,100  
Gross profit 95,200 79,300  
Equity in earnings of joint ventures 4,100 3,000  
Operating income (loss) 99,300 $ 82,300  
Segment assets $ 6,646,100   6,655,700
Gross profit as a % of revenue 5.20% 4.30%  
Construction Services      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 1,750,200 $ 1,678,600  
Gross profit 13,800 11,400  
Equity in earnings of joint ventures 4,300 2,600  
Loss on disposal activities   (41,000)  
Operating income (loss) 18,100 $ (27,000)  
Segment assets $ 3,516,100   3,556,200
Gross profit as a % of revenue 0.80% 0.70%  
Management Services      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 767,300 $ 757,000  
Gross profit 61,000 50,200  
Equity in earnings of joint ventures 13,000 19,600  
Operating income (loss) 74,000 $ 69,800  
Segment assets $ 2,631,900   $ 2,692,700
Gross profit as a % of revenue 7.90% 6.60%  
Management Services | Restatement Adjustment      
Summarized financial information concerning the Company's reportable segments      
Cost of revenue   $ 32,000  
Revenue   $ 33,000