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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 105,557 $ 94,052
Foreign currency translation 29,141 16,051
Unrealized gains on investments before income taxes 588 3,289
Income tax expense from unrealized gains on investments (22) (93)
Unrealized gains on investments, net of tax 566 3,196
Retirement liability adjustment before reclassifications (456) (1,000)
Retirement liability amounts reclassified to selling and administrative expenses 836 810
Retirement liability adjustment before income taxes 380 (190)
Income tax expense from retirement liability adjustment (344) (278)
Retirement liability adjustment, net of tax 36 (468)
Other comprehensive income 29,743 18,779
Comprehensive income $ 135,300 $ 112,831