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Segment Information - Identifiable assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financial information for each of the Company's business segments |  |
Assets | $ 2,062,986 | $ 1,745,732
Other |  |
Financial information for each of the Company's business segments |  |
Assets | 168,163 | 214,769
U.S. Health & Human Services | Operating Segments |  |
Financial information for each of the Company's business segments |  |
Assets | 701,864 | 500,641
U.S. Federal Services | Operating Segments |  |
Financial information for each of the Company's business segments |  |
Assets | 992,207 | 795,553
Outside the U.S. | Operating Segments |  |
Financial information for each of the Company's business segments |  |
Assets | $ 200,752 | $ 234,769

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