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Business Overview (Details) | 6 Months Ended
--- | ---
Mar. 31, 2018 employee location | Mar. 31, 2017
Concentration Risk [Line Items] |  |
Number of employees | employee | 1,400 |
Number of locations in which entity operates | location | 30 |
US Government [Member] | Customer concentration | Revenue concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% |
Department of Veterans Affairs [Member] | Customer concentration | Revenue concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 63.00% | 58.00%
Human Services and Solutions [Member] | Customer concentration | Revenue concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 33.00% | 30.00%
Department of Defense and Department of Veterans Affairs [Member] | Minimum |  |
Concentration Risk [Line Items] |  |
Government contract, term of award | 6 months |
Department of Defense and Department of Veterans Affairs [Member] | Maximum |  |
Concentration Risk [Line Items] |  |
Government contract, term of award | 2 years |

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