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Restructuring Reserve Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Summary of components of accrued liability with respect to Company's business restructuring activities    
Beginning balance $ 6,278 $ 1,100
Additions 1,314 10,058
Cash payments (5,186) (3,876)
Adjustments (70) (216)
Ending balance $ 2,336 $ 7,066