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Reportable Segments (Details) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
item
Jun. 30, 2012
Reportable Segments        
Number of reportable segments     2  
Summarized financial information concerning the Company's reportable segments        
Revenue $ 2,067,490,000 $ 2,095,138,000 $ 6,074,408,000 $ 6,135,269,000
Revenue, net of other direct costs 1,236,000,000 1,323,500,000 3,732,900,000 3,843,800,000
Gross profit (loss) 131,814,000 111,238,000 309,775,000 277,701,000
Equity in earnings of joint ventures 4,094,000 12,281,000 17,855,000 38,141,000
General and administrative expenses (24,010,000) (20,682,000) (73,365,000) (63,150,000)
Operating income 111,898,000 102,837,000 254,265,000 252,692,000
Gross profit as a % of revenue 6.40% 5.30% 5.10% 4.50%
Gross profit as a % of revenue, net of other direct costs 10.70% 8.40% 8.30% 7.20%
Professional Technical Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 1,847,100,000 1,846,500,000 5,384,200,000 5,455,000,000
Revenue, net of other direct costs 1,102,000,000 1,164,600,000 3,306,100,000 3,428,600,000
Gross profit (loss) 119,800,000 114,200,000 281,300,000 285,400,000
Equity in earnings of joint ventures 1,000,000 5,500,000 10,300,000 12,500,000
Operating income 120,800,000 119,700,000 291,600,000 297,900,000
Gross profit as a % of revenue 6.50% 6.20% 5.20% 5.20%
Gross profit as a % of revenue, net of other direct costs 10.90% 9.80% 8.50% 8.30%
Management Support Services
        
Summarized financial information concerning the Company's reportable segments        
Revenue 220,400,000 248,700,000 690,200,000 680,300,000
Revenue, net of other direct costs 134,000,000 158,900,000 426,800,000 415,200,000
Gross profit (loss) 12,000,000 (3,000,000) 28,500,000 (7,700,000)
Equity in earnings of joint ventures 3,100,000 6,800,000 7,600,000 25,700,000
Operating income 15,100,000 3,800,000 36,100,000 18,000,000
Gross profit as a % of revenue 5.40% (1.20%) 4.10% (1.10%)
Gross profit as a % of revenue, net of other direct costs 9.00% (1.90%) 6.70% (1.90%)
Corporate
        
Summarized financial information concerning the Company's reportable segments        
General and administrative expenses (24,000,000) (20,700,000) (73,400,000) (63,200,000)
Operating income $ (24,000,000) $ (20,700,000) $ (73,400,000) $ (63,200,000)