Debt (Schedule of Equipment Financings) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Equipment Financing Due Sep 30 2032 | Loans Payable
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%
Equipment Financing Due Sep 30 2032 | Loans Payable | Q1 2023 Tranche
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.30%
Principal Amount	$ 1,452
Equipment Financing Due Sep 30 2032 | Loans Payable | Q2 2023 Tranche
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.30%
Principal Amount	$ 1,888
Equipment Financing Due Sep 30 2032 | Loans Payable | Bloomberg Short-Term Bank Yield Index
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.05%
Equipment Financing Due May 31 2029 | Loans Payable
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.03%
Principal Amount	$ 2,041
Debt instrument, basis spread on variable rate	2.75%
Equipment Financing Due May 31 2029 | Loans Payable | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.28%
Equipment Financing Due Jun 30 2029 | Loans Payable
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.33%
Principal Amount	$ 6,208
Equipment Financings
Debt Instrument [Line Items]
Collateral amount, gross	163,250	$ 155,756
Collateral amount, net	137,241	131,594
Equipment Financings | Property, plant and equipment net | Machinery and equipment
Debt Instrument [Line Items]
Collateral amount, gross	82,163	86,294
Collateral amount, net	56,499	62,459
Equipment Financings | Property, plant and equipment net | Construction in process
Debt Instrument [Line Items]
Collateral amount, gross	20,393	14,201
Collateral amount, net	20,393	14,201
Equipment Financings | Receivables, net
Debt Instrument [Line Items]
Collateral amount, gross	1,820	108
Collateral amount, net	1,820	108
Equipment Financings | Prepaid and other current assets
Debt Instrument [Line Items]
Collateral amount, gross	4,172	3,276
Collateral amount, net	4,172	3,276
Equipment Financings | Other non‑current assets
Debt Instrument [Line Items]
Collateral amount, gross	54,702	51,877
Collateral amount, net	54,357	$ 51,550
Equipment Financings | Loans Payable
Debt Instrument [Line Items]
Principal Amount	$ 16,705
Equipment Financing Due April 30, 2030 | Loans Payable
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.14%
Principal Amount	$ 5,116