Employee Stock Plans (Stock Option and RSU Transactions) (Details) shares in Millions, $ in Millions	6 Months Ended
Apr. 01, 2018 USD ($) shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, October 2, 2016	31.4
Granted, Stock Options	3.7
Options exercised, Stock Options	(4.5)
Forfeited/expired, Stock Options	(1.0)
Options outstanding, April 2, 2017	29.6
Total unrecognized stock-based compensation expense, net of estimated forfeitures, Stock Options \| $	$ 40.3
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested RSUs, October 2, 2016	7.6
Granted, RSUs	6.7
RSUs vested, RSUs	(3.0)
Forfeited/expired, RSUs	(1.0)
Nonvested RSUs, April 2, 2017	10.3
Total unrecognized stock-based compensation expense, net of estimated forfeitures, RSUs \| $	$ 254.3

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Unrecognized cost of unvested options awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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