Credit Losses - Summary of Change in Allowance for Credit Losses (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2021 USD ($)
Receivables [Abstract]
Beginning balance	$ (1,394)
Current period recovery for expected credit losses	378
Write-offs charged against the allowance for expected credit losses	(118)
Foreign exchange impact on ending balance	107
Ending balance	$ (1,027)