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Reportable Segments (Details) (USD $)
 3 Months Ended
Dec. 31, 2012
segment
Dec. 31, 2011
Reportable Segments    
Number of reportable segments 2  
Summarized financial information concerning the Company's reportable segments    
Revenue $ 2,017,272,000 $ 2,029,180,000
Revenue, net of other direct costs 1,245,000,000 1,230,800,000
Gross profit 78,118,000 90,346,000
Equity in earnings of joint ventures 5,915,000 8,962,000
General and administrative expenses (22,102,000) (22,611,000)
Operating income 61,931,000 76,697,000
Gross profit as a % of revenue 3.90% 4.50%
Gross profit as a % of revenue, net of other direct costs 6.30% 7.30%
Professional Technical Services
    
Summarized financial information concerning the Company's reportable segments    
Revenue 1,771,200,000 1,807,400,000
Revenue, net of other direct costs 1,093,800,000 1,100,900,000
Gross profit 69,300,000 84,800,000
Equity in earnings of joint ventures 5,100,000 2,500,000
Operating income 74,400,000 87,300,000
Gross profit as a % of revenue 3.90% 4.70%
Gross profit as a % of revenue, net of other direct costs 6.30% 7.70%
Management Support Services
    
Summarized financial information concerning the Company's reportable segments    
Revenue 246,100,000 221,800,000
Revenue, net of other direct costs 151,200,000 129,900,000
Gross profit 8,800,000 5,500,000
Equity in earnings of joint ventures 800,000 6,500,000
Operating income 9,600,000 12,000,000
Gross profit as a % of revenue 3.60% 2.50%
Gross profit as a % of revenue, net of other direct costs 5.80% 4.20%
Corporate
    
Summarized financial information concerning the Company's reportable segments    
General and administrative expenses (22,100,000) (22,600,000)
Operating income $ (22,100,000) $ (22,600,000)