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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Goodwill [Roll Forward]      
Balance at the beginning of the period $ 59,839 $ 59,467 $ 59,819
Translation adjustments 33 372 (352)
Balance at the end of the period 59,872 59,839 59,467
CAG      
Goodwill [Roll Forward]      
Balance at the beginning of the period 21,550 21,178 21,530
Translation adjustments 33 372 (352)
Balance at the end of the period 21,583 21,550 21,178
GovDeals      
Goodwill [Roll Forward]      
Balance at the beginning of the period 23,731 23,731 23,731
Translation adjustments 0 0 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 14,558 14,558
Translation adjustments 0 0 0
Balance at the end of the period $ 14,558 $ 14,558 $ 14,558