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Income Taxes - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 10, 2018 | Sep. 30, 2021 | Sep. 30, 2020
Net operating loss (NOL) carryforwards |  |  |
Deferred tax assets related to available federal and state NOL carryforwards |  | $ 23,500 | $ 27,700
Net operating losses—Foreign |  | 13,593 | 12,709
NOL's subject to expiration |  | 400 |
Valuation allowance |  | 13,813 | 41,788
Deferred tax assets, amount expected to be realized |  | 27,900 |
Increase in valuation allowance |  | 27,900 |
Alternative minimum tax, refund |  | 1,700 |
Undistributed foreign earnings |  | 6,900 |
Cash and cash equivalents held overseas on which taxes would be incurred upon repatriation |  | 22,400 | $ 19,500
Unrecognized tax benefits, decrease resulting from foreign currency translation |  | 100 |
Machinio |  |  |
Net operating loss (NOL) carryforwards |  |  |
Percentage acquired | 100.00% |  |
Consideration paid | $ 19,900 |  |
Acquisition, deferred tax liability | $ 700 |  |
Acquisition, net operating loss |  | 1,400 |
Machinio | Deferred Tax Asset Related To Business Acquisition |  |  |
Net operating loss (NOL) carryforwards |  |  |
Increase in valuation allowance |  | $ 700 |

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