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Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance $ 1,744,551 $ 1,479,412 $ 1,480,158 $ 1,522,354
Other comprehensive income (loss) 16,748 (16,630) 27,102 (11,181)
Balance 1,993,544 1,482,635 1,993,544 1,482,635
Foreign Currency Translation Reclassification Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     (23,514) (12,523)
Other comprehensive loss before reclassifications, net of tax     24,131 (17,019)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax     0 0
Other comprehensive income (loss)     24,131 (17,019)
Balance 617 (29,542) 617 (29,542)
Unrealized Gains (Losses) on Marketable Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     3,480 (1,845)
Other comprehensive loss before reclassifications, net of tax     5,165 6,391
Amounts reclassified from accumulated other comprehensive income (loss), net of tax     (2,188) (442)
Other comprehensive income (loss)     2,977 5,949
Balance 6,457 4,104 6,457 4,104
Amortization of Prior Service Credit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     1,180 1,328
Other comprehensive loss before reclassifications, net of tax     0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (2) (37) (6) (111)
Other comprehensive income (loss)     (6) (111)
Balance 1,174 1,217 1,174 1,217
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (8,500) (7,591) (18,854) (13,040)
Other comprehensive loss before reclassifications, net of tax     29,296 (10,628)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (691) (382) (2,194) (553)
Other comprehensive income (loss) 16,748 (16,630) 27,102 (11,181)
Balance $ 8,248 $ (24,221) $ 8,248 $ (24,221)