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Employee Stock Purchase and Stock Option Plans (Stock Purchase and Stock Option Plans Information on the 1999 Plans) (Details) - shares | 12 Months Ended |
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized | 30,950,000 |
Number of remaining shares reserved for issuance at September 29, 2017 | 10,181,183 |
Number of shares relating to outstanding stock options at September 29, 2017 | 2,516,825 |
Number of shares available for future awards (in shares) | 7,664,358 | 7,552,708
1999 SIP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized | 29,850,000 |
Number of remaining shares reserved for issuance at September 29, 2017 | 9,641,396 |
Number of shares relating to outstanding stock options at September 29, 2017 | 2,289,450 |
Number of shares available for future awards (in shares) | 7,351,946 | 7,233,173
1999 SIP | Stock Appreciation Rights (SARs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award number of shares, non-fungible share basis (in shares) | 1 |
1999 SIP | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award number of shares, non-fungible share basis (in shares) | 1 |
1999 SIP | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award number of shares, fungible share basis (in shares) | 1.92 |
Award number of shares, non-fungible share basis (in shares) | 1 |
1999 SIP | Other than Option Stock Appreciation Rights (SARs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award number of shares, fungible share basis (in shares) | 1.92 |
1999 ODSP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized | 1,100,000 |
Number of remaining shares reserved for issuance at September 29, 2017 | 539,787 |
Number of shares relating to outstanding stock options at September 29, 2017 | 227,375 |
Number of shares available for future awards (in shares) | 312,412 | 319,535
Award number of shares, non-fungible share basis (in shares) | 1 |

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- Definition Share-based compensation arrangement by share-based payment award, award number of shares, non-fungible share basis. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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