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Business Overview (Details) | 9 Months Ended
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Jun. 30, 2018 employee location | Jun. 30, 2017
Concentration Risk [Line Items] |  |
Business base percentage, prime contracts | 99.00% |
Business base percentage, subcontracts | 1.00% |
VA and HSS | Minimum |  |
Concentration Risk [Line Items] |  |
Government contract, term of award | 4 months |
VA and HSS | Maximum |  |
Concentration Risk [Line Items] |  |
Government contract, term of award | 2 years |
Customer concentration | HSS |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 32.00% |
Customer concentration | Defense/VA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 65.00% |
Customer concentration | Public Health/Life Sciences |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% |
Customer concentration | Public Health/Life Sciences | Time and Materials |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 97.00% |
Customer concentration | Public Health/Life Sciences | Cost Plus Fixed Fee |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% |
Customer concentration | Public Health/Life Sciences | Firm Fixed Price |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% |
Customer concentration | Revenue concentration | US Federal Government |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% |
Customer concentration | Revenue concentration | VA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 64.00% | 58.00%
Customer concentration | Revenue concentration | HSS |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 34.00% | 32.00%
UNITED STATES |  |
Concentration Risk [Line Items] |  |
Number of employees | employee | 1,500 |
Number of locations in which entity operates | location | 30 |

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