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Goodwill (Tables)
12 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of goodwill activity The carrying value and changes in the carrying value of goodwill attributable to each reportable segment were as follows:
Goodwill (in thousands)CAGGovDealsMachinioTotal
Balance at September 30, 2018$21,530 $23,731 $14,558 $59,819 
Translation adjustments(352)— — (352)
Balance at September 30, 2019$21,178 $23,731 $14,558 $59,467 
Translation adjustments372 — — 372 
Balance at September 30, 2020$21,550 $23,731 $14,558 $59,839 
Translation adjustments33 — — 33 
Balance at September 30, 2021$21,583 $23,731 $14,558 $59,872