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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

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