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Reportable Segments and Geographic Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Summarized financial information concerning the Company's reportable segments                      
Number of reportable segments | item                 3    
Revenue $ 4,723,700 $ 4,549,500 $ 4,506,200 $ 4,210,500 $ 2,562,500 $ 1,968,200 $ 1,872,200 $ 1,953,900 $ 17,989,880 $ 8,356,783 $ 8,153,495
Cost of revenue 4,553,100 4,422,900 4,403,000 4,075,700 2,433,400 1,859,700 1,784,800 1,875,700 17,454,692 7,953,607 7,703,507
Gross profit 170,600 126,600 103,200 134,800 129,100 108,500 87,400 78,200 535,188 403,176 449,988
Equity in earnings of joint ventures 29,900 27,700 24,700 23,900 8,400 6,000 7,400 36,100 106,245 57,924 24,319
General and administrative expenses (25,500) (24,400) (29,800) (34,300) (15,500) (15,100) (26,400) (23,900) (113,975) (80,908) (97,318)
Acquisition and integration expenses (79,800) (88,500) (91,600) (138,500) (19,500) (7,800)     398,440 27,310  
Operating income (loss) 95,200 $ 41,400 $ 6,500 $ (14,100) 102,500 $ 91,600 $ 68,400 $ 90,400 129,018 352,882 376,989
Segment assets 14,014,298       6,123,377       14,014,298 $ 6,123,377  
Gross profit as a % of revenue                   4.80%  
Corporate                      
Summarized financial information concerning the Company's reportable segments                      
General and administrative expenses                 (114,000) $ (80,900) (97,300)
Acquisition and integration expenses                 (398,400) (27,300)  
Operating income (loss)                 (512,400) (108,200) (97,300)
Segment assets 609,800       365,000       609,800 365,000 240,100
Design and Consulting Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 7,962,900 5,443,100 5,556,100
Cost of revenue                 7,663,600 5,112,800 5,174,400
Gross profit                 299,300 330,300 381,700
Equity in earnings of joint ventures                 6,600 35,500 8,300
Operating income (loss)                 305,900 365,800 390,000
Segment assets 7,118,200       4,064,500       $ 7,118,200 $ 4,064,500 $ 1,945,900
Gross profit as a % of revenue                 3.80% 6.10% 6.90%
Construction Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 $ 6,676,700 $ 2,004,300 $ 1,552,100
Cost of revenue                 6,633,900 1,975,000 1,527,900
Gross profit                 42,800 29,300 24,200
Equity in earnings of joint ventures                 23,000 6,000 4,000
Operating income (loss)                 65,800 35,300 28,200
Segment assets 3,382,400       1,256,400       $ 3,382,400 $ 1,256,400 $ 1,183,400
Gross profit as a % of revenue                 0.60% 1.50% 1.60%
Management Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 $ 3,350,300 $ 909,400 $ 1,045,300
Cost of revenue                 3,157,200 865,800 1,001,200
Gross profit                 193,100 43,600 44,100
Equity in earnings of joint ventures                 76,600 16,300 12,000
Operating income (loss)                 269,700 60,000 56,100
Segment assets $ 2,903,900       $ 437,500       $ 2,903,900 $ 437,500 $ 2,296,200
Gross profit as a % of revenue                 5.80% 4.80% 4.20%