Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.23.3
Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Sep. 30, 2023
USD ($)
component
reportable_unit
Sep. 30, 2022
USD ($)
Oct. 01, 2021
USD ($)
Sep. 30, 2020
USD ($)
Summary Of Accounting Policies [Line Items]        
Restricted cash $ 837,000 $ 28,000    
Restricted investments 15,079,000 6,866,000    
Debt securities, available-for-sale, allowance for credit loss 0 0    
Weighted average cost inventory amount 75,500,000 64,800,000    
FIFO inventory amount $ 8,500,000 $ 9,400,000    
Number of reporting units | reportable_unit 1      
Amount retained for each claim paid     $ 1,000,000  
Amount retained by CIRCA per claim paid     $ 550,000  
Alabama, Florida, Georgia, North Carolina, South Carolina and Tennessee        
Summary Of Accounting Policies [Line Items]        
Number of platform operating companies | component 6      
Minimum        
Summary Of Accounting Policies [Line Items]        
Amount company is liable for per occurrence       $ 100,000
Stop-loss insurance purchased $ 100,000      
Maximum        
Summary Of Accounting Policies [Line Items]        
Amount company is liable for per occurrence       $ 500,000
Stop-loss insurance purchased $ 160,000