Credit Losses - Summary of Change in Allowance for Credit Losses (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2021 USD ($)
Receivables [Abstract]
Beginning balance	$ (1,394)
Current period recovery for expected credit losses	521
Write-offs charged against the allowance for expected credit losses	(109)
Foreign exchange impact on ending balance	82
Ending balance	$ (900)