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Borrowing Arrangements (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2011 | Oct. 01, 2010 | Oct. 02, 2009 | Mar. 02, 2007
Principal amount of convertible subordinated notes issued |  |  |  | $ 200,000,000
Debt Offering Number of Tranches |  |  |  | 2
Non convertible borrowing rate for estimating fair value | 6.86% | 6.86% |  |
Convertible Notes Payable | 26,089,000 | 24,743,000 |  |
Gains (Losses) on Extinguishment of Debt | 0 | (79,000) | 4,590,000 |
Principal amount of the convertible notes | 26,677,000 | 26,677,000 |  |
Fair value of equity component | 6,061,000 | 6,061,000 |  |
Amortized Period, in months | 6.0 |  |  |
Long-term debt consists of convertible notes | 0 | 24,743,000 |  |
Termination of credit facility | 50,000,000 | 0 | 0 |
Short-term debt | 26,089,000 | 50,000,000 |  |
Convertible Subordinated Notes 1.25% due March 2010 [Member] |  |  |  |
Principal amount of convertible subordinated notes issued |  |  |  | 100,000,000
Percentage of convertible subordinated notes |  |  |  | 1.25%
Convertible debt Premium Paid Upon Retirement |  | 15,100,000 |  |
Extinguishment of Debt, Amount |  | 32,600,000 |  |
Convertible Subordinated Notes 1.50% Due March 2012 [Member] |  |  |  |
Principal amount of convertible subordinated notes issued |  |  |  | 100,000,000
Debt instrument actual if converted value | 50,300,000 |  |  |
Non convertible borrowing rate for estimating fair value | 6.86% |  |  |
Percentage of convertible subordinated notes |  |  |  | 1.50%
Convertible debt Premium Paid Upon Retirement |  | 12,400,000 |  |
Extinguishment of Debt, Amount |  | 20,400,000 |  |
Conversion price of the 1.50% Notes per $1000 of principal amount | $ 105.0696 |  |  |
Conversion price | $ 9.52 |  |  |
Principal amount of the convertible notes |  |  | 77,300,000 |
Fair value of equity component |  |  | 22,700,000 |
Stock price to calculate if converted value | $ 17.96 |  |  |
If-converted value of the remaining Notes exceeds the related principal amount by | $ 23,600,000 |  |  |
Number of shares underlying the remaining 1.50% Notes | 2,800,000 | 2,802,206 |  |

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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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