CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Net income (loss)	$ 174,976	$ (223,546)	$ 260,197	$ (173,560)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $0, $0, $0, $0	15,981	(5,041)	24,944	5,229
Available-for-sale marketable securities:
Unrealized gains on marketable securities arising during period, net of tax of $765, $1,102, $1,185, $2,354, respectively	985	2,375	1,498	5,446
Less: Reclassification adjustment for gains included in net income (loss), net of tax of $(42), $(13), $(106), $(2), respectively	(83)	(51)	(177)	(134)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	902	2,324	1,321	5,312
Defined benefit pension and post-retirement plan:
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax of $(38), $(47), $(77), $(93), respectively	(68)	(83)	(136)	(163)
Prior service income arising during the period, net of tax of $0, $34, $0, $34, respectively		59		59
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(68)	(24)	(136)	(104)
Other comprehensive income (loss)	16,815	(2,741)	26,129	10,437
Comprehensive income (loss)	$ 191,791	$ (226,287)	$ 286,326	$ (163,123)