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Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 05, 2015
Jun. 29, 2014
Jul. 05, 2015
Jun. 29, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains, tax $ 40 $ 141 $ 209 $ 243
Prior service benefit, tax 42 42 85 85
Total reclassifications, tax $ 82 $ 183 $ 294 $ 328