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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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