Debt Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2017	Oct. 01, 2017
Debt Instrument [Line Items]
Long-term debt covenant compliance	The indentures under which the above notes were issued also require us to maintain compliance with certain covenants, including limits on future liens and sale and leaseback transactions on certain material properties. As of July 2, 2017, we were in compliance with all applicable covenants.
Two Point Two Percentage Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.20%
Debt Instrument, Face Amount	$ 500.0	$ 0.0
Two Point Two Percentage Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.75%
Debt Instrument, Face Amount	$ 500.0	0.0
PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member]
Debt Instrument [Line Items]
Stated Interest Rate	0.372%
Debt Instrument, Face Amount	$ 755.3	$ 755.3

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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