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Reportable Segments and Geographic Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
item
Sep. 30, 2013
Sep. 30, 2012
Summarized financial information concerning the Company's reportable segments                      
Revenue $ 2,562,500,000 $ 1,968,200,000 $ 1,872,200,000 $ 1,953,900,000 $ 2,079,100,000 $ 2,067,500,000 $ 1,989,600,000 $ 2,017,300,000 $ 8,356,783,000 $ 8,153,495,000 $ 8,218,180,000
Revenue, net of other direct costs                 4,855,600,000 4,977,000,000 5,183,900,000
Gross profit 129,100,000 108,500,000 87,400,000 78,200,000 140,200,000 131,800,000 99,900,000 78,100,000 403,176,000 449,988,000 421,859,000
Equity in earnings of joint ventures 8,400,000 6,000,000 7,400,000 36,100,000 6,400,000 4,100,000 7,900,000 5,900,000 57,924,000 24,319,000 48,650,000
General and administrative expenses (15,500,000) (15,100,000) (26,400,000) (23,900,000) (23,900,000) (24,000,000) (27,300,000) (22,100,000) (80,908,000) (97,318,000) (80,903,000)
Acquisition and integration expense 19,500,000 7,800,000             (27,310,000)    
Goodwill impairment                     (336,000,000)
Operating income (loss) 102,500,000 91,600,000 68,400,000 90,400,000 122,700,000 111,900,000 80,500,000 61,900,000 352,882,000 376,989,000 53,606,000
Assets 6,123,377,000       5,665,623,000       6,123,377,000 5,665,623,000  
Gross profit as a % of revenue                 4.80% 5.50% 5.10%
Gross profit as a % of revenue, net of other direct costs                 8.30% 9.00% 8.10%
Number of reportable segments                 2    
Corporate, Non-Segment [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
General and administrative expenses                 (80,900,000) (97,300,000) (80,900,000)
Acquisition and integration expense                 (27,300,000)    
Operating income (loss)                 (108,200,000) (97,300,000) (80,900,000)
Intersegment Eliminations [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
Assets 365,000,000       240,100,000       365,000,000 240,100,000  
Professional Technical Services [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 7,609,900,000 7,242,900,000 7,276,900,000
Revenue, net of other direct costs                 4,462,700,000 4,416,400,000 4,607,300,000
Gross profit                 365,200,000 416,900,000 423,800,000
Equity in earnings of joint ventures                 41,400,000 12,300,000 16,800,000
Goodwill impairment                     (155,000,000)
Operating income (loss)                     285,600,000
Gross profit as a % of revenue                 4.80% 5.80% 5.80%
Gross profit as a % of revenue, net of other direct costs                 8.20% 9.40% 9.20%
Professional Technical Services [Member] | Operating Segments [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
Operating income (loss)                 406,600,000 429,200,000  
Assets 5,366,000,000       4,827,500,000       5,366,000,000 4,827,500,000  
Management Support Services [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
Revenue                 746,900,000 910,600,000 941,300,000
Revenue, net of other direct costs                 392,900,000 560,600,000 576,600,000
Gross profit                 38,000,000 33,100,000 (1,900,000)
Equity in earnings of joint ventures                 16,500,000 12,000,000 31,800,000
Goodwill impairment                     (181,000,000)
Operating income (loss)                     (151,100,000)
Gross profit as a % of revenue                 5.10% 3.60% (0.20%)
Gross profit as a % of revenue, net of other direct costs                 9.70% 5.90% (0.30%)
Management Support Services [Member] | Operating Segments [Member]
                      
Summarized financial information concerning the Company's reportable segments                      
Operating income (loss)                 54,500,000 45,100,000  
Assets $ 392,400,000       $ 598,000,000       $ 392,400,000 $ 598,000,000