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DoD Contracts with DLA Disposition Services (Details) - contract	9 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
U.S. Department of Defense
Significant Contracts
Number of contracts			2	2	2
Scrap Contract
Significant Contracts
Adjusted percentage of profit sharing distribution			64.50%
Scrap Contract | U.S. Department of Defense | Revenue
Significant Contracts
Concentration risk (as a percent)			7.40%	10.20%	11.10%
Surplus Contract | U.S. Department of Defense | Revenue
Significant Contracts
Concentration risk (as a percent)			0.00%	12.40%	27.60%
Surplus Contract | Non-rolling stock surplus contract
Significant Contracts
Usable surplus property to be purchased as a fixed percentage of DoD's original acquisition value		4.35%
Profits from resale of the property (as a percent)	100.00%

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Number Of Contracts

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Represents the percentage of profits from resale of the property retained by the entity.

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Represents the fixed percentage of DoD's original acquisition value at which the entity is required to purchase all usable surplus property offered to it by the Department of Defense.

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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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