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v3.19.3.a.u2

Summary of Significant Accounting Policies - Concentration (Details) - contract | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
U.S. Department of Defense |  |  |
Risk Associated with Certain Concentrations |  |  |
Number of contracts | 2 | 2 | 2
U.S. Department of Defense | Revenue | Surplus Contract |  |  |
Risk Associated with Certain Concentrations |  |  |
Concentration risk (as a percent) | 0.00% | 12.40% | 27.60%
U.S. Department of Defense | Revenue | Scrap Contract |  |  |
Risk Associated with Certain Concentrations |  |  |
Concentration risk (as a percent) | 7.40% | 10.20% | 11.10%
Supplier Concentration Risk | Cost of Goods Sold | Contract with commercial client |  |  |
Risk Associated with Certain Concentrations |  |  |
Concentration risk (as a percent) | 43.60% | 33.70% | 21.80%
Maximum |  |  |
Risk Associated with Certain Concentrations |  |  |
Term for release of funds to the seller | 30 days |  |

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