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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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