Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Capitalized Contract Cost [Line Items]
Current contract assets	$ 900,000	$ 4,400,000
Non-current contract assets	0	0
Current contract liabilities	1,900,000	4,100,000
Revenue recognized included in contract liability	$ 3,200,000
Practical Expedient, Incremental Costs	true
Current capitalized costs	$ 172,000	128,000
Non-current capitalized costs	0
Incremental costs amortized	436,000	366,000
Impairment related to costs capitalized	$ 0	0
Payment terms	30 days
Remaining Performance Obligation, Optional Exemption	true
Minimum
Capitalized Contract Cost [Line Items]
Amortization Period	3 years
Maximum
Capitalized Contract Cost [Line Items]
Amortization Period	6 years
TS
Capitalized Contract Cost [Line Items]
Current capitalized costs	$ 0	9,000
Non-current capitalized costs	0	0
Incremental costs amortized	9,000	13,000
Impairment related to costs capitalized	$ 0	$ 0
Europe | Maximum
Capitalized Contract Cost [Line Items]
Payment terms	90 days