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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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