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Summary of Significant Accounting Policies (Acquisitions and Divestitures) (Details) - USD ($) $ in Millions | Jun. 29, 2018 | Jul. 31, 2017 | Dec. 24, 2014 | Feb. 28, 2011
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SoLayTec, B.V. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired |  | 49.00% | 51.00% |
Kingstone Hong Kong |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired |  |  |  | 55.00%
Kingstone Hong Kong |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Remaining ownership percentage disposed of | 15.00% |  |  |
Proceeds from sale of business | $ 5.7 |  |  |

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