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Goodwill - Changes in Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Goodwill
Balance at the beginning of the period	$ 59,467	$ 59,819
Translation adjustments	63	(352)
Balance at the end of the period	59,530	59,467
CAG
Goodwill
Balance at the beginning of the period	21,178	21,530
Translation adjustments	63	(352)
Balance at the end of the period	21,241	21,178
GovDeals
Goodwill
Balance at the beginning of the period	23,731	23,731
Translation adjustments	0	0
Balance at the end of the period	23,731	23,731
Machinio
Goodwill
Balance at the beginning of the period	14,558	14,558
Translation adjustments	0	0
Balance at the end of the period	$ 14,558	$ 14,558

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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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

No definition available.

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