Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($) Customer	Sep. 30, 2023 USD ($) Customer
Significant Accounting Policies [Line Items]
Inventories	$ 1.1	$ 1.1	$ 0.5
Provision relating to bankruptcy	6.1
Trade Receivable
Significant Accounting Policies [Line Items]
Provision relating to bankruptcy	0.1
Contract Asset
Significant Accounting Policies [Line Items]
Provision relating to bankruptcy	$ 6.0
Concentration of Credit Risk | Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Number of major customers | Customer		1	2
Concentration of Credit Risk | Accounts Receivable, Net | Customer One
Significant Accounting Policies [Line Items]
Concentration risk, percentage		12.50%	10.80%
Concentration of Credit Risk | Accounts Receivable, Net | Customer Two
Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.10%