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Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)
 6 Months Ended
Mar. 31, 2014
item
Mar. 31, 2013
Mar. 31, 2014
Professional Technical Services
Mar. 31, 2013
Professional Technical Services
Mar. 31, 2014
Management Support Services
Sep. 30, 2013
Management Support Services
Mar. 31, 2013
Management Support Services
Sep. 30, 2012
Management Support Services
Business Acquisitions, Goodwill and Intangible Assets                
Number of business acquisitions 0              
Maximum period to determine final value of identifiable intangible assets 12 months              
Changes in the carrying value of goodwill by reporting segment                
Goodwill at the beginning of the period $ 1,811,754,000 $ 1,775,400,000 $ 1,645,000,000 $ 1,608,600,000 $ 166,800,000 $ 166,800,000 $ 166,800,000 $ 166,800,000
Post-Acquisition Adjustments 5,000,000   5,000,000          
Foreign Exchange Impact (8,500,000) (15,700,000) (8,500,000) (15,700,000)        
Acquired 79,100,000 48,200,000 79,100,000 48,200,000        
Goodwill at the end of the period $ 1,887,447,000 $ 1,807,900,000 $ 1,720,600,000 $ 1,641,100,000 $ 166,800,000 $ 166,800,000 $ 166,800,000 $ 166,800,000