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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%