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Business Overview (Details)	12 Months Ended
	Sep. 30, 2018 contract option	Sep. 30, 2017
Concentration Risk [Line Items]
Business base percentage, prime contracts	99.00%
Business base percentage, subcontracts	1.00%
Customer concentration | Time and Materials
Concentration Risk [Line Items]
Concentration risk percentage	95.00%
Customer concentration | Cost Plus Fixed Fee
Concentration Risk [Line Items]
Concentration risk percentage	3.00%
Customer concentration | Firm Fixed Price
Concentration Risk [Line Items]
Concentration risk percentage	2.00%
Customer concentration | Defense/VA
Concentration Risk [Line Items]
Concentration risk percentage	65.00%
Customer concentration | HSS
Concentration Risk [Line Items]
Concentration risk percentage	31.00%
Customer concentration | Public Health/Life Sciences
Concentration Risk [Line Items]
Concentration risk percentage	4.00%
Customer concentration | Public Health/Life Sciences | Time and Materials
Concentration Risk [Line Items]
Concentration risk percentage	95.00%
Customer concentration | Public Health/Life Sciences | Cost Plus Fixed Fee
Concentration Risk [Line Items]
Concentration risk percentage	3.00%
Customer concentration | Public Health/Life Sciences | Firm Fixed Price
Concentration Risk [Line Items]
Concentration risk percentage	2.00%
Customer concentration | Revenue concentration | US Federal Government
Concentration Risk [Line Items]
Concentration risk percentage	100.00%
Customer concentration | Revenue concentration | HSS
Concentration Risk [Line Items]
Concentration risk percentage	34.00%	34.00%
Customer concentration | Revenue concentration | VA
Concentration Risk [Line Items]
Concentration risk percentage	63.00%	62.00%
Number of contracts	16
Customer concentration | Revenue concentration | VA | Pharmacy Services
Concentration Risk [Line Items]
Concentration risk percentage	57.00%
Number of contracts	9
Customer concentration | Revenue concentration | VA | Logistic Services
Concentration Risk [Line Items]
Number of contracts	7
Customer concentration | Revenue concentration | Head Start Program | Time and Materials
Concentration Risk [Line Items]
Concentration risk percentage	31.00%	29.00%
Number of option periods of contract | option	4
Term of contract	5 years

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