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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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Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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