Annual report pursuant to Section 13 and 15(d)

Business segments - Schedule of Identifiable Assets (Details)

v3.8.0.1
Business segments - Schedule of Identifiable Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]    
Identifiable assets $ 1,350,662 $ 1,348,819
Operating segments | Health Services    
Segment Reporting Information [Line Items]    
Identifiable assets 515,850 543,361
Operating segments | U.S. Federal Services    
Segment Reporting Information [Line Items]    
Identifiable assets 397,824 440,006
Operating segments | Human Services    
Segment Reporting Information [Line Items]    
Identifiable assets 169,523 153,141
Corporate/Other    
Segment Reporting Information [Line Items]    
Identifiable assets $ 267,465 $ 212,311