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Goodwill - Narrative (Details)	6 Months Ended
	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Goodwill impairment	$ 0
CAG
Segment Reporting Information [Line Items]
Percentage of fair value in excess of carrying value	21.00%
Machinio
Segment Reporting Information [Line Items]
Percentage of fair value in excess of carrying value	12.00%

X

- Definition

Amount of loss from the write-down of an asset representing the 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 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
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-Publisher FASB
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-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

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- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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