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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, 2016 | Jan. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, balance |  |  | $ 8,495 |  |
Interest rate swap rate term |  |  | 10 years |  |
Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, balance |  |  | $ 400 |  |
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 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt acquired |  |  |  |  | $ 7,200
BTU International, Inc (BTU) Merger | Mortgage Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, balance |  |  | $ 6,200 |  |
Interest rate |  |  |  | 4.11% |
SoLayTec, B.V. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, balance |  |  | $ 1,900 |  |
Interest rate |  |  | 7.00% |  |
Additional borrowings |  |  |  | $ 300 |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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