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Composition of Certain Financial Statement Captions - Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Property and equipment:    
Data processing equipment and software $ 110,874 $ 104,789
Office furniture and equipment 21,443 22,207
Leasehold improvements 33,360 29,158
Equipment under capital leases 6,398 0
Less: accumulated depreciation and amortization (119,048) (107,317)
Total $ 53,027 $ 48,837