Property, Plant, and Equipment (Secured Financings) (Details) - Equipment Financings - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, plant and equipment gross [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	$ 119,619	$ 71,403
Property, plant and equipment net [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	103,170	60,718
Machinery and equipment | Property, plant and equipment gross [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	89,115	63,305
Machinery and equipment | Property, plant and equipment net [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	72,666	52,620
Construction in process | Property, plant and equipment gross [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	30,504	8,098
Construction in process | Property, plant and equipment net [Member]
Debt Instrument [Line Items]
Pledged Assets, Not Separately Reported, Other	$ 30,504	$ 8,098