Geographic Information - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 120,812	$ 128,764
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	71,325	76,016
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	44,933	48,126
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,554	$ 4,622