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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2016 USD ($) Customer instrument Segment | Sep. 30, 2015 USD ($) Customer Segment
Accounting Policies [Line Items] |  |
Number of operating segments | Segment | 1 | 1
Allowance for doubtful accounts | $ 706,000 | $ 1,127,000
Accounts receivable, written off | 581,000 | 0
Bad debt expense | $ 359,000 | $ 487,000
Percentage of inventory estimated using LIFO method | 44.00% | 38.00%
Reserve for obsolete and excess inventory | $ 3,308,000 | $ 3,022,000
Property, plant and equipment, impairment | 0 | 0
Depreciation expense | 8,173,000 | 6,048,000
Cork, Ireland facility, accumulated depreciation | 50,079,000 | 42,243,000
Decrease in workers' compensation expense |  | 400,000
Research and development expense | 0 | 0
Other long-term liabilities | $ 605,000 | 506,000
Interest Rate Swap | Cash Flow Hedging |  |
Accounting Policies [Line Items] |  |
Number of interest rate swaps | instrument | 1 |
Interest rate swap agreement amount | $ 8,214,000 |
Interest rate swap fair value | 30,000 |
Subsidiaries |  |
Accounting Policies [Line Items] |  |
Rental income, quarterly installment | 103,000 |
Cork, Ireland facility, carrying value | 1,496,000 | 1,570,000
Cork, Ireland facility, accumulated depreciation | 1,437,000 | 1,511,000
Rental income | $ 413,000 | $ 413,000
Minimum |  |
Accounting Policies [Line Items] |  |
Intangible assets amortized over useful lives (in years) | 1 year |
Maximum |  |
Accounting Policies [Line Items] |  |
Intangible assets amortized over useful lives (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 |
Customer Concentration Risk | Sales Revenue, Net |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 21.00% |
Number of major customer | Customer | 2 | 1
Customer Concentration Risk | Sales Revenue, Net | Total Customers And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 46.00% | 38.00%
Number of major customer | Customer | 4 | 2
Customer Concentration Risk | Sales Revenue, Net | Major Customer One And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 12.00% | 22.00%
Customer Concentration Risk | Sales Revenue, Net | Major Customer Two And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 12.00% | 16.00%
Customer Concentration Risk | Sales Revenue, Net | Major Customer Three And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 11.00% |
Customer Concentration Risk | Sales Revenue, Net | Major Customer Four And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 11.00% |
Customer Concentration Risk | Sales Revenue, Net | Customer One |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk |  | 12.00%
Customer Concentration Risk | Accounts Receivable |  |
Accounting Policies [Line Items] |  |
Number of major customer | Customer | 2 | 1
Customer Concentration Risk | Accounts Receivable | Total Customers And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Number of major customer | Customer | 4 | 2
Customer Concentration Risk | Accounts Receivable | Major Customer One And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 15.00% | 18.00%
Customer Concentration Risk | Accounts Receivable | Major Customer Two And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 13.00% | 16.00%
Customer Concentration Risk | Accounts Receivable | Major Customer Three And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 12.00% |
Customer Concentration Risk | Accounts Receivable | Major Customer Four And Their Subcontractors |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 11.00% |
Customer Concentration Risk | Accounts Receivable | Customer One |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 14.00% | 11.00%
Customer Concentration Risk | Accounts Receivable | Customer Two |  |
Accounting Policies [Line Items] |  |
Percentage of concentration risk | 11.00% |
Scenario, Previously Reported |  |
Accounting Policies [Line Items] |  |
Reclassification of other operating liabilities |  | $ 506,000

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