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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 23, 2012
Sep. 24, 2011
Fair Value Measurements    
Total fair value of derivatives $ (12,266) $ (12,983)
Recurring basis | Level 2
   
Fair Value Measurements    
Derivative assets   34
Derivative liabilities fair value (12,266) (13,017)
Total fair value of derivatives $ (12,266) $ (12,983)