Geographic Information - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 128,764	$ 139,420
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	76,016	82,589
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	48,126	52,122
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,622	$ 4,709