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Restructuring Reserve Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Summary of components of accrued liability with respect to Company's business restructuring activities    
Beginning balance $ 6,278 $ 1,100
Additions 188 1,747
Cash payments (2,535) (1,533)
Adjustments (57) 39
Ending balance $ 3,874 $ 1,353