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Reportable Segments (Details) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
item
Mar. 31, 2013
Reportable Segments        
Number of reportable segments     2  
Summarized financial information concerning the Company's reportable segments        
Revenue $ 1,872,224,000 $ 1,989,646,000 $ 3,826,099,000 $ 4,006,918,000
Revenue, net of other direct costs 1,180,200,000 1,251,900,000 2,331,700,000 2,496,900,000
Gross profit 87,407,000 99,843,000 165,605,000 177,961,000
Equity in earnings of joint ventures 7,436,000 7,846,000 43,519,000 13,761,000
General and administrative expenses (26,449,000) (27,253,000) (50,294,000) (49,355,000)
Operating income (loss) 68,394,000 80,436,000 158,830,000 142,367,000
Gross profit as a % of revenue 4.70% 5.00% 4.30% 4.40%
Gross profit as a % of revenue, net of other direct costs 7.40% 8.00% 7.10% 7.10%
Corporate
        
Summarized financial information concerning the Company's reportable segments        
General and administrative expenses (26,400,000) (27,300,000) (50,300,000) (49,400,000)
Operating income (loss) (26,400,000) (27,300,000) (50,300,000) (49,400,000)
Professional Technical Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 1,683,600,000 1,765,900,000 3,453,800,000 3,537,100,000
Revenue, net of other direct costs 1,088,100,000 1,110,300,000 2,129,700,000 2,204,100,000
Gross profit 85,300,000 92,200,000 145,200,000 161,400,000
Equity in earnings of joint ventures 300,000 4,100,000 34,500,000 9,400,000
Operating income (loss) 85,600,000 96,300,000 179,700,000 170,800,000
Gross profit as a % of revenue 5.10% 5.20% 4.20% 4.60%
Gross profit as a % of revenue, net of other direct costs 7.80% 8.30% 6.80% 7.30%
Management Support Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 188,600,000 223,700,000 372,300,000 469,800,000
Revenue, net of other direct costs 92,100,000 141,600,000 202,000,000 292,800,000
Gross profit 2,100,000 7,700,000 20,400,000 16,600,000
Equity in earnings of joint ventures 7,100,000 3,800,000 9,000,000 4,400,000
Operating income (loss) $ 9,200,000 $ 11,500,000 $ 29,400,000 $ 21,000,000
Gross profit as a % of revenue 1.10% 3.40% 5.50% 3.50%
Gross profit as a % of revenue, net of other direct costs 2.30% 5.40% 10.10% 5.70%