Property, Plant and Equipment - Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 190,592	$ 175,447
Less accumulated depreciation and amortization	(130,604)	(118,466)
Property, Plant and Equipment, Net, Total	59,988	56,981
Buildings and land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47,745	46,608
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56,982	55,352
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	55,794	48,647
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,842	4,034
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,433	18,045
Capital projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,796	$ 2,761