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Long-Term Debt (Details) - USD ($) $ in Thousands			12 Months Ended
	Sep. 26, 2021	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2016
Debt Instrument [Line Items]
Long-term debt, balance				$ 8,334
Interest rate swap rate term			10 years
Secured Debt
Debt Instrument [Line Items]
Long-term debt, balance			$ 400	$ 300
Interest rate				2.23%
Interest rate discount			1.00%
Debt instrument, term			15 years
Agreement
Debt Instrument [Line Items]
Extinguishment of debt		$ 2,400
Swap Rate | Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			2.40%
Mortgage Note | Federal Home Loan Board Five Year Classic Advance Rate | Scenario, Forecast
Debt Instrument [Line Items]
Basis spread on variable rate	240.00%
BTU International, Inc (BTU) Merger | Mortgage Note
Debt Instrument [Line Items]
Long-term debt, balance				$ 5,900
Interest rate					4.11%
SoLayTec, B.V.
Debt Instrument [Line Items]
Long-term debt, balance				$ 2,100
Interest rate			7.00%
Additional borrowings			$ 300

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- Definition

Debt Instrument, Interest Rate, Discount

+ References

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Interest Rate Swap Rate Term

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross amount of debt extinguished.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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