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Business Overview (Details) | 3 Months Ended
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Dec. 31, 2018 employee contract location option | Dec. 31, 2017
Revenue concentration | Customer concentration | US Federal Government |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% |
Revenue concentration | Customer concentration | VA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 68.00% | 66.00%
Number of contracts | 16 |
Revenue concentration | Customer concentration | VA | Pharmacy Services |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 58.00% |
Number of contracts | 9 |
Revenue concentration | Customer concentration | VA | Logistic Services |  |
Concentration Risk [Line Items] |  |
Number of contracts | 7 |
Revenue concentration | Customer concentration | HHS |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 30.00% | 32.00%
Revenue concentration | Customer concentration | Defense/VA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 69.00% |
Revenue concentration | Customer concentration | Human Services and Solutions |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 29.00% |
Revenue concentration | Customer concentration | Public Health/Life Sciences |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% |
Revenue concentration | Customer concentration | Public Health/Life Sciences | Time and materials |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 97.00% |
Revenue concentration | Customer concentration | Public Health/Life Sciences | Cost plus fixed fee |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% |
Revenue concentration | Customer concentration | Public Health/Life Sciences | Firm fixed price |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% |
Revenue concentration | Customer concentration | Head Start Program |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 28.00% | 28.00%
Revenue concentration | Customer concentration | Head Start Program | Time and materials |  |
Concentration Risk [Line Items] |  |
Government contract, number of option periods | option | 4 |
Government contract, term of award | 5 years |
Revenue concentration | Revenue from Rights Concentration Risk [Member] | Prime |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 99.00% |
Revenue concentration | Revenue from Rights Concentration Risk [Member] | Subcontractor |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% |
UNITED STATES |  |
Concentration Risk [Line Items] |  |
Number of employees | employee | 1,600 |
Number of locations in which entity operates | location | 30 |

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