Segment and Geographic Information - Long-Lived Assets, Consisting of Property, Plant and Equipment by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 205,744	$ 154,470
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	78,533	84,809
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	53,146	56,585
Asia / Pacific / Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3,411	1,466
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 70,654	$ 11,610