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Business Overview (Details) | 6 Months Ended
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Mar. 31, 2017 employee location | Mar. 31, 2016
Concentration Risk [Line Items] |  |
Number of employees (employee) | employee | 1,400 |
Minimum number of locations in which entity operates (location) | location | 30 |
US Government [Member] | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 100.00% |
Human Services and Solutions [Member] | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 30.00% |
Department of Veterans Affairs [Member] | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 58.00% | 95.00%

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