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Fair Value (Fair Value, Asset Measured on Recurring Basis, Using Unobservable Inputs) (Details) (Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 28, 2012
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
ARS, Beginning Balance $ 3,093
Sale of auction rate securities (805)
ARS, Ending Balance $ 2,288