Segment Information - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 109,457	$ 114,372
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	62,308	67,071
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	42,375	42,580
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,774	$ 4,721