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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 05, 2015
Jun. 29, 2014
Jul. 05, 2015
Jun. 29, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 4,689 $ 4,000
Other comprehensive income (loss) before reclassifications, net of tax     (7,143) 2,304
Amounts reclassified from accumulated other comprehensive income, net of tax $ (305) $ (346) (708) (595)
Other comprehensive (loss) income (9,247) 819 (7,851) 1,709
Ending balance (3,162) 5,709 (3,162) 5,709
Unrealized Gains (Losses) on Marketable Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     2,365 1,381
Other comprehensive income (loss) before reclassifications, net of tax     (876) 2,304
Amounts reclassified from accumulated other comprehensive income, net of tax     (561) (448)
Other comprehensive (loss) income     (1,437) 1,856
Ending balance 928 3,237 928 3,237
Retirement Plans Prior Service Benefit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     2,324 2,619
Amounts reclassified from accumulated other comprehensive income, net of tax     (147) (147)
Other comprehensive (loss) income     (147) (147)
Ending balance 2,177 $ 2,472 2,177 $ 2,472
Foreign currency translation reclassification adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, net of tax     (6,267)  
Other comprehensive (loss) income     (6,267)  
Ending balance $ (6,267)   $ (6,267)