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Borrowing Arrangements (Narrative) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 28, 2012 | Sep. 30, 2011 | Mar. 02, 2007 tranches
Debt Instrument [Line Items] |  |  |
Principal amount of convertible subordinated notes issued | $ 0 | $ 26,677,000 | $ 200,000,000
Debt Offering Number of Tranches |  |  | 2
Principal amount of the convertible notes |  | 26,700,000 |
Convertible debt Premium Paid Upon Retirement | 21,300,000 |  |
Convertible Subordinated Notes 1.25% due March 2010 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of convertible subordinated notes issued |  |  | 100,000,000
Percentage of convertible subordinated notes |  |  | 1.25%
Convertible Subordinated Notes 1.50% Due March 2012 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of convertible subordinated notes issued |  |  | $ 100,000,000
Percentage of convertible subordinated notes |  |  | 1.50%

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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