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Major Clients (Details) (Revenue, Percentage of total revenue)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Percentage of total revenue      
Period for which criteria of threshold percentage for disclosure not met in past 5 years    
Maximum
     
Percentage of total revenue      
Percentage of revenue accounted for by no other single client (as a percent) 10.00%    
Agencies of the U.S. federal government
     
Percentage of total revenue      
Percentage of the Company's revenue (as a percent) 18.00% 18.00% 22.00%
Agencies of the U.S. federal government | Management Support Services
     
Percentage of total revenue      
Percentage of the Company's revenue (as a percent) 4.00% 4.00% 3.00%