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Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 59,819	$ 45,388	$ 45,134
Translation adjustments	(352)	(127)	254
Business acquisition		14,558
Balance at the end of the period	59,467	59,819	45,388
RSCG
Goodwill [Roll Forward]
Balance at the beginning of the period	0	0	0
Translation adjustments	0	0	0
Business acquisition		0
Balance at the end of the period	0	0	0
CAG
Goodwill [Roll Forward]
Balance at the beginning of the period	21,530	21,657	21,403
Translation adjustments	(352)	(127)	254
Business acquisition		0
Balance at the end of the period	21,178	21,530	21,657
GovDeals
Goodwill [Roll Forward]
Balance at the beginning of the period	23,731	23,731	23,731
Translation adjustments	0	0	0
Business acquisition		0
Balance at the end of the period	23,731	23,731	23,731
Machinio
Goodwill [Roll Forward]
Balance at the beginning of the period	14,558	0	0
Translation adjustments	0	0	0
Business acquisition		14,558
Balance at the end of the period	$ 14,558	$ 14,558	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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