Business Overview (Details)	9 Months Ended
	Jun. 30, 2017 employee location	Jun. 30, 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)	32.00%
Department of Veterans Affairs [Member] | Revenue concentration | Customer concentration
Concentration Risk [Line Items]
Concentration risk percentage (percent)	58.00%	83.00%