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Property and Equipment (Details) (USD $)
In Thousands
Jun. 30, 2011
Sep. 30, 2010
Property and Equipment    
Land and building $ 5,972 $ 5,842
Leasehold improvements 5,810 5,586
Computer hardware 22,268 17,672
Computer software 55,814 47,245
Furniture and equipment 1,390 1,210
Property and equipment, gross 91,254 77,555
Less: accumulated depreciation (48,373) (41,326)
Property and equipment, net $ 42,881 $ 36,229