Annual report pursuant to Section 13 and 15(d)

Acquisitions - Acquisition of Central Steel Additional Information (Details)

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Acquisitions - Acquisition of Central Steel Additional Information (Details)
 12 Months Ended
May 15, 2024
USD ($)
option
Jan. 18, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Business Combination Segment Allocation [Line Items]          
Note amount   $ 34,000,000.0      
Working capital adjustment     $ 702,000 $ 0  
Net borrowings under revolver loans     3,420,000 13,672,000  
Total goodwill     61,152,000 75,866,000 $ 41,093,000
Central Steel          
Business Combination Segment Allocation [Line Items]          
Net purchase price $ 13,880,000        
Cash consideration at close 10,700,000   $ 10,474,000 $ 0  
Note amount 1,100,000        
Net purchase price 122,000        
Working capital adjustment 200,000        
Fair value of earnout $ 2,000,000        
Earn-out period 5 years        
Net borrowings under revolver loans $ 3,300,000        
Purchase price for equity interests 0        
Total goodwill 2,906,000        
Central Steel | Broadview, Illinois Sale Lease Back Transaction          
Business Combination Segment Allocation [Line Items]          
Sale leaseback transaction, net book value 8,300,000        
Net proceeds received 7,900,000        
Seller fees incurred $ 400,000        
Lease term 20 years        
Lessee, renewal option | option 2        
Lessee, renewal term 5 years        
Lessee, annual rent escalation (in percent) 2.00%        
Gain recognized on sale $ 0        
Central Steel | Broadview, Illinois Sale Lease Back Transaction | Louisville lease agreement          
Business Combination Segment Allocation [Line Items]          
Lessee base rent 58,795        
Central Steel | Maximum          
Business Combination Segment Allocation [Line Items]          
Net purchase price 300,000        
Central Steel | Minimum          
Business Combination Segment Allocation [Line Items]          
Net purchase price $ 100,000