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Net Periodic Cost for U.K Defined Benefit Pension Plans (Detail) (UNITED KINGDOM, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
UNITED KINGDOM
   
Components of the net periodic pension cost:    
Interest cost $ 356 $ 341
Expected return on plan assets (347) (313)
Amortization of actuarial loss 168 97
Net periodic pension cost $ 177 $ 125