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Commitments and Contingencies (Details) $ in Millions				3 Months Ended		6 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jan. 15, 2016 USD ($)	Jan. 09, 2015 USD ($)	Jun. 20, 2013 USD ($)	Mar. 25, 2016 USD ($) claim	Mar. 27, 2015 USD ($)	Mar. 25, 2016 USD ($) claim	Sep. 25, 2015 USD ($)
Loss Contingencies
Document Period End Date						Mar. 25, 2016
Remedial costs
Environmental Matters [Abstract]
Loss contingency costs, minimum				$ 21.0		$ 21.0
Loss contingency costs, maximum				70.0		70.0
Probable contingency loss				31.0		31.0
Loss contingency accrual, accrued and other current liabilities				11.0		11.0
Loss contingency accrual, other liabilities				20.0		20.0
Remediation and monitoring costs
Environmental Matters [Abstract]
Loss contingency costs, minimum				13.0		13.0
Loss contingency costs, maximum				45.0		45.0
Probable contingency loss				21.0		21.0
Loss contingency accrual, accrued and other current liabilities				9.0		9.0
Loss contingency accrual, other liabilities				$ 12.0		$ 12.0
2007 Tax Sharing Agreement
Compliance Matters
Income tax examination, additional taxes owed			$ 883.3
Income tax examination, proposed tax penalties			154.0
Income tax examination, amount of additional tax deficiency			$ 30.0
Asbestos Matters
Asbestos Matters
Pending claims, number \| claim				3,100		3,100
asbestos liability reserve, net				$ 24.0		$ 24.0	$ 28.0
asbestos liability reserve, gross				500.0		500.0	515.0
asbestos related insurance recovery assets				476.0		$ 476.0	487.0
Cash and other assets transferred to QSF		$ 278.0
Settlements received by QSF from insurers					$ 22.0
TE Connectivity
Compliance Matters
Payment made to tax sharing agreement parties in anticipation of tax ruling				120.0
TE Connectivity \| 2007 Tax Sharing Agreement
Compliance Matters
Tax liability share percentage						31.00%
Medtronic
Compliance Matters
Payment made to tax sharing agreement parties in anticipation of tax ruling				2.0
Medtronic \| 2007 Tax Sharing Agreement
Compliance Matters
Tax liability share percentage						42.00%
Tyco International \| 2007 Tax Sharing Agreement
Compliance Matters
Tax liability share percentage						27.00%
Accrued and Other Current Liabilities \| Asbestos Matters
Asbestos Matters
asbestos liability reserve, gross				10.0		$ 10.0	23.0
Other Liabilities \| Asbestos Matters
Asbestos Matters
asbestos liability reserve, gross				490.0		490.0	492.0
Prepaid Expenses and Other Current Assets \| Asbestos Matters
Asbestos Matters
asbestos liability reserve, gross							38.0
asbestos related insurance recovery assets				37.0		37.0
Restricted Cash and Cash Equivalents				3.0		3.0	11.0
Restricted Investments				265.0		265.0	263.0
Other Assets \| Asbestos Matters
Asbestos Matters
asbestos liability reserve, gross							$ 449.0
asbestos related insurance recovery assets				$ 439.0		$ 439.0
Minimum
Compliance Matters
Income tax examination, additional taxes owed	$ 475.0
Minimum \| 2007 Tax Sharing Agreement
Compliance Matters
Income tax examination, additional taxes owed	475.0
Maximum
Compliance Matters
Income tax examination, additional taxes owed	$ 525.0