Annual report pursuant to Section 13 and 15(d)

Business segments - Schedule of Identifiable Assets (Details)

v3.20.2
Business segments - Schedule of Identifiable Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]    
Identifiable assets $ 2,024,702 $ 1,745,732
Operating segments | U.S. Services    
Segment Reporting Information [Line Items]    
Identifiable assets 702,728 500,641
Operating segments | U.S. Federal Services    
Segment Reporting Information [Line Items]    
Identifiable assets 937,477 795,553
Operating segments | Outside the U.S.    
Segment Reporting Information [Line Items]    
Identifiable assets 224,532 234,769
Corporate/Other    
Segment Reporting Information [Line Items]    
Identifiable assets $ 159,965 $ 214,769