Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 268,828	$ 262,575
Less: Accumulated depreciation	(173,255)	(162,645)
Total property and equipment, net	95,573	99,930
Land and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	2,869	2,867
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	61,793	60,340
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	201,351	196,621
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,815	$ 2,747