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Business Overview (Details)	3 Months Ended	9 Months Ended
	Jun. 30, 2019 employee option contract market business_area location	Jun. 30, 2019 employee option contract market business_area location	Jun. 30, 2018
Concentration Risk [Line Items]
Number of market focus areas | business_area	3	3
Number of market leveraging core competencies | market	7	7
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		65.00%	64.00%
Number of contracts	16	16
Revenue concentration | Customer concentration | VA | Pharmacy Services
Concentration Risk [Line Items]
Concentration risk percentage		58.00%
Number of contracts	9	9
Revenue concentration | Customer concentration | VA | Logistic Services
Concentration Risk [Line Items]
Number of contracts	7	7
Revenue concentration | Customer concentration | HHS
Concentration Risk [Line Items]
Concentration risk percentage		33.00%	34.00%
Revenue concentration | Customer concentration | Defense/VA
Concentration Risk [Line Items]
Concentration risk percentage		66.00%
Revenue concentration | Customer concentration | Human Services and Solutions
Concentration Risk [Line Items]
Concentration risk percentage		28.00%
Revenue concentration | Customer concentration | Public Health/Life Sciences
Concentration Risk [Line Items]
Concentration risk percentage		6.00%
Revenue concentration | Customer concentration | Head Start Program
Concentration Risk [Line Items]
Concentration risk percentage		27.00%	32.00%
Revenue concentration | Customer concentration | Head Start Program | Time and materials
Concentration Risk [Line Items]
Government contract, number of option periods | option	4	4
Government contract, term of award		5 years
Revenue concentration | Revenue from Rights Concentration Risk | Prime
Concentration Risk [Line Items]
Concentration risk percentage	95.00%
Revenue concentration | Revenue from Rights Concentration Risk | Subcontractor
Concentration Risk [Line Items]
Concentration risk percentage	5.00%
UNITED STATES
Concentration Risk [Line Items]
Number of employees | employee	1,900	1,900
Number of locations in which entity operates | location	30	30

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Government Contract, Number of Option Periods

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