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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%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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