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Income Taxes - CarryForwards (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 10, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Net operating loss (NOL) carryforwards |  |  |  |
Deferred tax assets related to available federal and state NOL carryforwards |  | $ 27,900 | $ 28,400 |
Deferred tax assets related to available foreign NOL carryforwards |  | 13,009 | $ 10,163 |
Blended effective tax rate (as a percentage) |  |  | 24.50% |
Tax benefit relating to adjustment in corporate tax rate |  |  | $ 10,700 |
Increase (decrease) in valuation allowance |  | 2,600 |  |
Valuation allowance |  | 41,909 | 39,337 |
Undistributed foreign earnings |  | 2,800 |  |
Cash and cash equivalents held overseas on which taxes would be incurred upon repatriation |  | 21,000 | 14,400 |
Reconciliation of unrecognized tax benefits |  |  |  |
Beginning balance |  | 0 | 0 | $ 725
Additions based on positions related to the current year |  | 0 | 0 | 0
Additions for tax positions of prior years |  | 273 | 107 | 1,426
Reductions for tax positions of prior years |  | 0 | (107) | (229)
Settlements |  | 0 | 0 | (1,922)
Ending balance |  | 273 | $ 0 | $ 0
Foreign |  |  |  |
Net operating loss (NOL) carryforwards |  |  |  |
NOL's subject to expiration |  | 400 |  |
Reconciliation of unrecognized tax benefits |  |  |  |
Unrecognized tax benefits related to foreign operations |  | 300 |  |
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 (decrease) in valuation allowance |  | $ 700 |  |

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