Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Contribution Plan Disclosure [Line Items]
Employee matching contribution, percent	60.00%
Employees auto enrolled upon eligibility, contribution rate	6.00%
Employee contributions match	$ 400,000	$ 500,000	$ 400,000
Pension Plan | NIGPP
Defined Contribution Plan Disclosure [Line Items]
Multiemployer plan, agreement renewal period	3 years
Multiemployer plan, agreement expiration date	Sep. 30, 2025
Multiemployer plan, contribution amount	$ 35,000	$ 36,000	$ 38,000
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employee participants eligible compensation each payroll period, percent	3.60%