Segment and Geographic Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	$ 75,095	$ 103,899
United States
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	71,742	98,395
Canada
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	1,459	3,653
Colombia
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	449	590
Russian Federation
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	1,010	689
United Kingdom
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	422	559
China
Schedule Of Long Lived Assets [Line Items]
Long-lived assets, excluding deferred tax assets	$ 13	$ 13