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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |
Borrowings |  | $ 33,000 | $ 70,000
Preliminary purchase price, net of cash acquired |  | $ 32,678 | $ 67,079
IBA |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of equity interest acquired | 100.00% | 100.00% |
Preliminary purchase price | $ 32,706 |  |
Transaction expenses and acquisition costs | 1,800 |  |
Preliminary purchase price, net of cash acquired | 32,000 |  |
Escrow funds | 400 | $ 400 |
IBA | Term loan | Secured Debt |  |  |
Business Acquisition [Line Items] |  |  |
Borrowings | $ 33,000 |  |

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