Property, Plant and Equipment - Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 251,403	$ 190,592
Less accumulated depreciation and amortization	(150,734)	(130,604)
Property, Plant and Equipment, Net, Total	100,669	59,988
Buildings, land, and land use right
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50,583	47,745
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61,603	56,982
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	89,481	55,794
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,423	4,842
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,612	19,433
Capital projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,701	$ 5,796