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DoD Contracts with DLA Disposition Services (Details) - contract
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Significant Contracts    
Number of contracts 1  
Scrap Contract    
Significant Contracts    
Adjusted percentage of profit sharing distribution 64.50%  
Scrap Contract | U.S. Department of Defense | Revenue    
Significant Contracts    
Concentration risk   7.40%