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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, net of tax |  |  | $ (21,270) | $ 26,442
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  | 1,346 | (313)
Other comprehensive (loss) income | $ (29,384) | $ 16,815 | (19,924) | 26,129
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  | 769 |
Reclassification of unrealized gains on equity securities, net of tax | (199) | (83) | 1,469 | (177)
Balance | 1,739,940 |  | 1,739,940 |
ASU 2016-01 |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification of unrealized gains on equity securities, net of tax |  |  | (3,125) |
Foreign Currency Translation Reclassification Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 15,919 | (21,921)
Other comprehensive income (loss) before reclassifications, net of tax |  |  | (18,781) | 24,944
Other comprehensive (loss) income |  |  | (18,781) | 24,944
Balance | (2,862) | 3,023 | (2,862) | 3,023
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 1,362 | (60)
Other comprehensive income (loss) before reclassifications, net of tax |  |  | (2,489) | 1,498
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  | 1,469 | (177)
Other comprehensive (loss) income |  |  | (1,020) | 1,321
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  | 691 |
Balance | (2,092) | 1,261 | (2,092) | 1,261
Unrealized Gains (Losses) on Marketable Securities | ASU 2016-01 |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification of unrealized gains on equity securities, net of tax |  |  | (3,125) |
Amortization of Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 1,495 | 1,767
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (61) | (68) | (123) | (136)
Other comprehensive (loss) income |  |  | (123) | (136)
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  | 78 |
Balance | 1,450 | 1,631 | 1,450 | 1,631
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 18,776 | (20,214)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (260) | (151) | 1,346 | (313)
Balance | $ (3,504) | $ 5,915 | $ (3,504) | $ 5,915

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