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v3.20.1

Summary of Significant Accounting Policies - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended | 54 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2019 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) contract | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) contract | Mar. 31, 2020 USD ($) | Oct. 01, 2019 USD ($) | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contract asset |  |  | $ 300,000 |  | $ 300,000 |  | $ 300,000 |  | $ 300,000
Contract liability |  |  | 3,000,000.0 |  | 3,000,000.0 |  | 3,000,000.0 |  | 3,000,000.0
Contract liability recognized as revenue |  |  |  |  | 2,300,000 |  |  |  |
Interest income |  |  | 257,000 | $ 451,000 | 509,000 | $ 770,000 |  |  |
Operating lease assets |  |  | 10,437,000 |  | 10,437,000 |  | 10,437,000 |  |
Total lease liabilities |  |  | $ 11,174,000 |  | $ 11,174,000 |  | 11,174,000 |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating lease assets |  |  |  |  |  |  |  | $ 11,300,000 |
Total lease liabilities |  |  |  |  |  |  |  | $ 12,200,000 |
Supplier Concentration Risk | Cost of Goods | Contract With Commercial Client |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as a percentage) |  |  | 55.30% | 49.40% | 51.90% | 44.90% |  |  |
Government Contracts Concentration Risk | Scrap Contract |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of contracts | contract |  |  |  | 1 |  | 1 |  |  |
Government Contracts Concentration Risk | Sales Revenue | Scrap Contract |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as a percentage) |  |  |  | 7.60% |  | 7.60% |  |  |
Tanager Acquisitions Promissory Note |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Receivable with imputed interest, face amount |  | $ 12,300,000 |  |  |  |  |  |  |
Receivable with imputed interest, term |  | 5 years |  |  |  |  |  |  |
Proceeds from collection of notes receivable | $ 2,500,000 |  |  |  |  |  | 6,600,000 |  |
Interest income | 400,000 |  |  |  |  |  |  |  |
Prepayment discount | $ 500,000 |  |  |  |  |  |  |  |
Receivable with imputed interest, net amount |  |  | $ 5,700,000 |  | $ 5,700,000 |  | 5,700,000 |  |
Tanager Acquisitions Promissory Note | Other Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Receivable with imputed interest, net amount |  |  | 4,600,000 |  | 4,600,000 |  | 4,600,000 |  |
Tanager Acquisitions Promissory Note | Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Receivable with imputed interest, net amount |  |  | 1,100,000 |  | 1,100,000 |  | 1,100,000 |  |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contract costs |  |  | $ 500,000 |  | $ 500,000 |  | $ 500,000 |  | $ 500,000

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