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Intangible Assets (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 30, 2015 | Dec. 24, 2014 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Amortization of intangible assets |  |  | $ 0.8 | $ 0.8 | $ 1.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Amortization in fiscal year 2018 |  |  | 0.6 |  |
Amortization in fiscal year 2019 |  |  | 0.6 |  |
Amortization in fiscal year 2020 |  |  | 0.6 |  |
Amortization in fiscal year 2021 |  |  | 0.4 |  |
Amortization in fiscal year 2022 |  |  | 0.3 |  |
Amortization thereafter |  |  | $ 1.2 |  |
SoLayTec, B.V. |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Percentage of voting interests acquired |  | 51.00% |  |  |
Intangible assets acquired |  | $ 2.1 |  |  |
BTU International, Inc (BTU) |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets acquired | $ 2.9 |  |  |  |
Technology | SoLayTec, B.V. |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets acquired |  | 1.9 |  |  |
Trade names | SoLayTec, B.V. |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets acquired |  | $ 0.2 |  |  |
Trade names | BTU International, Inc (BTU) |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets acquired | 1.2 |  |  |  |
Customer lists | BTU International, Inc (BTU) |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets acquired | $ 1.7 |  |  |  |
Kingstone Holding Company |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Intangible assets derecognized |  |  |  |  | 3.2
Accumulated amortization derecognized |  |  |  |  | $ 1.9

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