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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Professional Technical Services
Mar. 31, 2012
Professional Technical Services
Mar. 31, 2012
Management Support Services
Mar. 31, 2013
Management Support Services
Sep. 30, 2012
Management Support Services
Changes in the carrying value of goodwill by reporting segment              
Goodwill at the beginning of the period $ 1,775,352,000 $ 2,086,300,000 $ 1,608,600,000 $ 1,733,900,000 $ 352,400,000 $ 166,800,000 $ 166,800,000
Post-Acquisition Adjustments   7,100,000   (400,000) 7,500,000    
Foreign Exchange Impact (15,700,000) 20,900,000 (15,700,000) 20,900,000      
Acquired 48,200,000 11,000,000 48,200,000 11,000,000      
Goodwill at the end of the period $ 1,807,943,000 $ 2,125,300,000 $ 1,641,100,000 $ 1,765,400,000 $ 359,900,000 $ 166,800,000 $ 166,800,000