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Reportable Segments and Geographic Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Sep. 30, 2014
USD ($)
item
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Summarized financial information concerning the Company's reportable segments                      
Number of reportable segments | item                 2    
Revenue $ 2,562,500 $ 1,968,200 $ 1,872,200 $ 1,953,900 $ 2,079,100 $ 2,067,500 $ 1,989,600 $ 2,017,300 $ 8,356,783 $ 8,153,495 $ 8,218,180
Cost of revenue. 2,433,400 1,859,700 1,784,800 1,875,700 1,938,900 1,935,700 1,889,700 1,939,200 7,953,607 7,703,507 7,796,321
Gross profit 129,100 108,500 87,400 78,200 140,200 131,800 99,900 78,100 403,176 449,988 421,859
Equity in (losses) earnings of joint ventures 8,400 6,000 7,400 36,100 6,400 4,100 7,900 5,900 57,924 24,319 48,650
General and administrative expenses (15,500) (15,100) (26,400) (23,900) (23,900) (24,000) (27,300) (22,100) (80,908) (97,318) (80,903)
Acquisition and integration expenses (19,500) (7,800)             (27,310)    
Goodwill impairment                     (336,000)
Operating income 102,500 $ 91,600 $ 68,400 $ 90,400 122,700 $ 111,900 $ 80,500 $ 61,900 $ 352,882 $ 376,989 $ 53,606
Gross profit as a % of revenue                 4.80% 5.50% 5.10%
Total Assets 6,123,377       5,665,623       $ 6,123,377 $ 5,665,623  
Corporate                      
Summarized financial information concerning the Company's reportable segments                      
General and administrative expenses                 (80,900) (97,300) $ (80,900)
Acquisition and integration expenses                 (27,300)    
Operating income                 (108,200) (97,300) (80,900)
Total Assets 365,000       240,100       365,000 240,100  
Parent                      
Summarized financial information concerning the Company's reportable segments                      
General and administrative expenses                 (80,900) (97,300) (80,900)
Acquisition and integration expenses                 (27,300)    
Operating income                 238,500 237,000 (38,500)
Total Assets 3,565,500       3,602,000       3,565,500 3,602,000  
Design and Consulting Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 5,443,100 5,556,100 5,773,600
Cost of revenue.                 5,112,800 5,174,400 5,374,800
Gross profit                 330,300 381,700 398,800
Equity in (losses) earnings of joint ventures                 35,500 8,300 10,900
Goodwill impairment                     (155,000)
Operating income                 $ 365,800 $ 390,000 $ 254,700
Gross profit as a % of revenue                 6.10% 6.90% 6.90%
Total Assets 4,064,500       1,945,900       $ 4,064,500 $ 1,945,900  
Construction Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 2,004,300 1,552,100 $ 1,391,600
Cost of revenue.                 1,975,000 1,527,900 1,370,200
Gross profit                 29,300 24,200 21,400
Equity in (losses) earnings of joint ventures                 6,000 4,000 5,800
Operating income                 $ 35,300 $ 28,200 $ 27,200
Gross profit as a % of revenue                 1.50% 1.60% 1.50%
Total Assets 1,256,400       1,183,400       $ 1,256,400 $ 1,183,400  
Management Services                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 909,400 1,045,300 $ 1,053,000
Cost of revenue.                 865,800 1,001,200 1,051,300
Gross profit                 43,600 44,100 1,700
Equity in (losses) earnings of joint ventures                 16,400 12,000 31,900
Goodwill impairment                     (181,000)
Operating income                 $ 60,000 $ 56,100 $ (147,400)
Gross profit as a % of revenue                 4.80% 4.20% 0.20%
Total Assets $ 437,500       $ 2,296,200       $ 437,500 $ 2,296,200