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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 USD ($) customer shares | Sep. 30, 2022 USD ($) customer shares
Accounting Policies [Line Items] |  |
Allowance for doubtful accounts | $ 242 | $ 111
Accounts receivable, allowance for credit loss, writeoffs | 16 | 53
Bad debt expense (benefit) | $ 143 | $ (3)
Percentage of inventory estimated using LIFO method | 19.00% | 42.00%
Net realizable value reserves | $ 669 | $ 1,538
Obsolete and excess inventory valuation reserves, net of writedown | 3,380 | 3,546
Depreciation expense | $ 6,170 | $ 6,035
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares) | shares | 202,000 | 270,000
Benefit from employee retention credit | $ 1,772 |
Proceeds from employee retention credit refund | 1,688 |
Employee retention credit interest income | 84 |
Employee retention credit manufacturing credit | 1,452 |
Employee retention credit costs | 236 |
Employee retention credit professional fees | $ 354 |
Restricted shares |  |
Accounting Policies [Line Items] |  |
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares) | shares | 0 | 0
Minimum |  |
Accounting Policies [Line Items] |  |
Finite-lived intangible asset, useful life (in years) | 1 year |
Maximum |  |
Accounting Policies [Line Items] |  |
Finite-lived intangible asset, useful life (in years) | 10 years |
Building and Building Improvements | Minimum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 5 years |
Building and Building Improvements | Maximum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 40 years |
Machinery and Equipment | Minimum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 3 years |
Machinery and Equipment | Maximum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 20 years |
Computer Software | Minimum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 3 years |
Computer Software | Maximum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 7 years |
Leasehold Improvements | Minimum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 6 years |
Leasehold Improvements | Maximum |  |
Accounting Policies [Line Items] |  |
Property, plant and equipment, useful life (in years) | 15 years |
Customer Concentration Risk | Sales Revenue, Net | Customer One |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 12.00% | 11.00%
Number of major customers | customer | 1 | 1
Customer Concentration Risk | Sales Revenue, Net | Total Customers and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 32.00% | 23.00%
Number of major customers | customer | 3 | 2
Customer Concentration Risk | Sales Revenue, Net | Major Customer One and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 12.00% | 12.00%
Customer Concentration Risk | Sales Revenue, Net | Major Customer Two and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 10.00% | 11.00%
Customer Concentration Risk | Sales Revenue, Net | Major Customer Three and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 10.00% |
Customer Concentration Risk | Accounts Receivable | Customer One |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 11.00% |
Number of major customers | customer | 1 |
Customer Concentration Risk | Accounts Receivable | Total Customers and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 13.00% |
Number of major customers | customer | 1 | 4
Customer Concentration Risk | Accounts Receivable | Major Customer One and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 15.00%
Customer Concentration Risk | Accounts Receivable | Major Customer Two and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 11.00%
Customer Concentration Risk | Accounts Receivable | Major Customer Three and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 11.00%
Customer Concentration Risk | Accounts Receivable | Major Customer Four and Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 10.00%
Customer Concentration Risk | Accounts Receivable | Three Largest Customers |  |
Accounting Policies [Line Items] |  |
Number of major customers | customer |  | 3
Customer Concentration Risk | Accounts Receivable | Customer One |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 15.00%
Customer Concentration Risk | Accounts Receivable | Customer Two |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 11.00%
Customer Concentration Risk | Accounts Receivable | Customer Three |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 10.00%

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