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Reportable Segments (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Summarized financial information concerning the Company's reportable segments      
Number of reportable segments | segment 3    
Revenue $ 4,297,651 $ 4,210,468  
Gross profit 140,858 134,730  
Equity in earnings of joint ventures 25,263 23,924  
General and administrative expenses (28,639) (34,338)  
Acquisition and integration expenses (41,038) (138,463)  
Operating income (loss) 96,444 $ (14,147)  
Segment assets $ 13,529,403   $ 14,014,298
Gross profit as a % of revenue 3.30% 3.20%  
Corporate      
Summarized financial information concerning the Company's reportable segments      
General and administrative expenses $ (28,700) $ (34,300)  
Acquisition and integration expenses (41,000) (138,500)  
Operating income (loss) (69,700) (172,800)  
Segment assets 593,000   609,800
Design and Consulting Services      
Summarized financial information concerning the Company's reportable segments      
Revenue 1,862,100 1,891,700  
Gross profit 79,300 46,300  
Equity in earnings of joint ventures 3,000 1,500  
Operating income (loss) 82,300 $ 47,800  
Segment assets $ 6,895,400   7,118,200
Gross profit as a % of revenue 4.30% 2.40%  
Construction Services      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 1,711,800 $ 1,534,100  
Gross profit 12,900 35,400  
Equity in earnings of joint ventures 2,700 5,800  
Operating income (loss) 15,600 $ 41,200  
Segment assets $ 3,284,800   3,382,400
Gross profit as a % of revenue 0.80% 2.30%  
Management Services      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 723,800 $ 784,700  
Gross profit 48,700 53,100  
Equity in earnings of joint ventures 19,500 16,600  
Operating income (loss) 68,200 $ 69,700  
Segment assets $ 2,756,200   $ 2,903,900
Gross profit as a % of revenue 6.70% 6.80%