Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Additional Information (Details)

v3.22.2.2
Benefit Plans - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
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 $ 300,000 $ 300,000  
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 $ 38,000 $ 39,000 $ 44,000  
Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Employee participants eligible compensation each payroll period, percent 3.60%