Property, Plant and Equipment - Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 190,685	$ 194,917
Less accumulated depreciation and amortization	(132,223)	(140,032)
Property, Plant and Equipment, Net, Total	58,462	54,885
Buildings and land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46,641	45,772
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56,544	65,989
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61,173	54,896
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,376	5,704
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,938	17,128
Capital projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,013	$ 5,428