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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Sep. 30, 2016 | Jun. 29, 2018 | Jun. 27, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Discrete benefit from valuation allowance release related to refundable AMT credits under Tax Cuts and Jobs Act | $ 3.3 |  |  |  |
Provisional decrease related to reduction of tax rate on certain deferred tax assets and deferred tax liabilities | $ 53.8 |  |  |  |
Forecast |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Statutory U.S. federal tax rate |  |  |  | 28.10% |
Foreign Tax Authority | Inland Revenue, Singapore (IRAS) |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income taxes paid |  |  |  |  | $ 13.2
Tax refunds |  | $ 1.3 | $ 3.7 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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