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Reportable Segments (Details) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
item
Mar. 31, 2012
Reportable Segments        
Number of reportable segments     2  
Summarized financial information concerning the Company's reportable segments        
Revenue $ 1,989,646,000 $ 2,010,951,000 $ 4,006,918,000 $ 4,040,131,000
Revenue, net of other direct costs 1,251,900,000 1,289,500,000 2,496,900,000 2,520,300,000
Gross profit (loss) 99,843,000 76,117,000 177,961,000 166,463,000
Equity in earnings of joint ventures 7,846,000 16,898,000 13,761,000 25,860,000
General and administrative expenses (27,253,000) (19,857,000) (49,355,000) (42,468,000)
Operating income 80,436,000 73,158,000 142,367,000 149,855,000
Gross profit as a % of revenue 5.00% 3.80% 4.40% 4.10%
Gross profit as a % of revenue, net of other direct costs 8.00% 5.90% 7.10% 6.60%
Professional Technical Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 1,765,900,000 1,801,100,000 3,537,100,000 3,608,500,000
Revenue, net of other direct costs 1,110,300,000 1,163,100,000 2,204,100,000 2,264,000,000
Gross profit (loss) 92,200,000 86,400,000 161,400,000 171,200,000
Equity in earnings of joint ventures 4,100,000 4,600,000 9,400,000 7,000,000
Operating income 96,300,000 91,000,000 170,800,000 178,200,000
Gross profit as a % of revenue 5.20% 4.80% 4.60% 4.70%
Gross profit as a % of revenue, net of other direct costs 8.30% 7.40% 7.30% 7.60%
Management Support Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 223,700,000 209,800,000 469,800,000 431,600,000
Revenue, net of other direct costs 141,600,000 126,400,000 292,800,000 256,300,000
Gross profit (loss) 7,700,000 (10,200,000) 16,600,000 (4,700,000)
Equity in earnings of joint ventures 3,800,000 12,300,000 4,400,000 18,900,000
Operating income 11,500,000 2,100,000 21,000,000 14,200,000
Gross profit as a % of revenue 3.40% (4.90%) 3.50% (1.10%)
Gross profit as a % of revenue, net of other direct costs 5.40% (8.10%) 5.70% (1.80%)
Corporate
        
Summarized financial information concerning the Company's reportable segments        
General and administrative expenses (27,300,000) (19,900,000) (49,400,000) (42,500,000)
Operating income $ (27,300,000) $ (19,900,000) $ (49,400,000) $ (42,500,000)