Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 224.6	$ 0.0	$ 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	18.3	$ 0.0	$ 0.0
Unrecognized Tax Benefits	$ 18.9
United States tax rate	24.60%	35.00%	35.00%
Foreign tax rate difference	$ (111.9)	$ (174.6)	$ (160.8)
Statutory Tax Rate Due to Change in Legislation	21.00%
Income tax holiday	Sep. 30, 2020
Impact of tax holiday	$ 38.4	$ 37.4
Impact of tax holiday on diluted earnings per share (in dollars per share)	$ 0.21	$ 0.20
Valuation Allowance, Amount	$ 118.6	$ 90.9
Tax benefit to recognize if valuation allowance is reversed	118.6
Future taxable income needed to utilize deferred tax assets	88.5
Federal net operating loss carry forwards	$ 41.0
Operating loss carryforwards, expiration date	Dec. 31, 2035
Total unrecognized tax benefits that would impact the effective tax rate	$ 77.7
Previously unrecognized tax benefits related to the expiration of the statute of limitations	10.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	4.1
Decreases relating to settlements with taxing authorities	0.0
Accrued interest or penalties related to unrecognized tax benefit	7.5
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	18.1
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	100.5
Tax credit carryforward	$ 97.0
UNITED STATES
Income Taxes [Line Items]
Open tax year	2000
CALIFORNIA
Income Taxes [Line Items]
Open tax year	1999
CANADA
Income Taxes [Line Items]
Open tax year	2012
LUXEMBOURG
Income Taxes [Line Items]
Open tax year	2012
MEXICO
Income Taxes [Line Items]
Open tax year	2012
SINGAPORE
Income Taxes [Line Items]
Open tax year	2012
Business Acquisition, Acquiree [Member]
Income Taxes [Line Items]
Federal net operating loss carry forwards	$ 32.7
Business Acquisition, Acquiree [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	1.5
Years One through Five [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	18.0
Repatriation of Foreign Earnings [Member]
Income Taxes [Line Items]
Liabilities, Noncurrent	206.6
Year Six [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	33.6
Year Seven [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	44.9
Year Eight [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 56.1