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Changes in Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, tax | $ 60 | $ (102) |  |
Foreign currency translation adjustments, tax | 0 | 0 | $ 0 | $ 0
Unrealized gains on marketable securities, tax | (418) | 565 | 1,815 | 209
Retirement plans prior service benefit, tax | (1,028) | (816) | $ (932) | $ (778)
Reclassification of unrealized gains on equity securities, net of tax | (78) | 64 |  |
Foreign Currency Translation Reclassification Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income, tax | 0 | 0 |  |
Other comprehensive income (loss), tax | 0 | 0 |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax | 0 |  |  |
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | (718) | 420 |  |
Amounts reclassified from accumulated other comprehensive income, tax | 78 | (64) |  |
Other comprehensive income (loss), tax | (640) | 356 |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax | (691) |  |  |
Amortization of Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income, tax | (18) | (38) |  |
Other comprehensive income (loss), tax | (18) | $ (38) |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax | (78) |  |  |
ASU 2016-01 | Foreign Currency Translation Reclassification Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification of unrealized gains on equity securities, net of tax | 0 |  |  |
ASU 2016-01 | Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification of unrealized gains on equity securities, net of tax | (902) |  |  |
ASU 2016-01 | Amortization of Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification of unrealized gains on equity securities, net of tax | $ 0 |  |  |

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- Definition The tax effect from the total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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