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Borrowing Arrangements (Narrative) (Details) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 30, 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
Extinguishment of Debt, Amount | 26,700,000 |  |
Convertible debt Premium Paid Upon Retirement | 21,400,000 |  |
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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