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Business Overview (Details) | 12 Months Ended
--- | ---
Sep. 30, 2017 employee location | Sep. 30, 2016
Concentration Risk [Line Items] |  |
Number of employees (more than 1,400) | employee | 1,400 |
Minimum number of locations in which entity operates | location | 30 |
VA and HHS | Minimum |  |
Concentration Risk [Line Items] |  |
Term of government contract | 1 year |
VA and HHS | Maximum |  |
Concentration Risk [Line Items] |  |
Term of government contract | 3 years |
Revenue concentration | Customer concentration | VA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 62.00% | 72.00%
Revenue concentration | Customer concentration | HHS |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 34.00% | 13.00%

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