Segment Information - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 114,372	$ 120,812
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	67,071	71,325
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	42,580	44,933
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,721	$ 4,554