Segment and Geographic Information - Long-Lived Assets, Consisting of Property, Plant and Equipment by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 130,719	$ 88,735
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	60,710	53,608
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	60,600	53,600
Asia/Pacific/Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	55,494	23,455
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 14,515	$ 11,672