Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		17 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Dec. 31, 2014	Dec. 12, 2014	May. 31, 2014
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		$ (34,931)	$ (149,348)	$ (185,591)	$ (174,077)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		(2,553)	(19,264)	(260)	(13,534)
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		89	101	782	300
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(883)	(551)	(2,607)	(1,657)
Net change in accumulated other comprehensive income (loss)		(36,512)	(167,960)	(182,462)	(185,654)
Stock Repurchase Program, Authorized Amount		$ 400,000		400,000		$ 400,000	$ 400,000	$ 200,000	$ 200,000
Treasury Stock, Shares, Acquired		901,233				5,856,583
Treasury Stock, Value, Acquired, Cost Method		$ 49,989				$ 330,586
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	[1]	(35,575)	(149,533)	(186,913)	(174,195)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		(2,553)	(995)	(260)	4,735
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		0	0	550	0
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax		36	36	105	109
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		19,887	29,586	27,821	49,056
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		644	185	1,322	118
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	(18,269)	0	(18,269)
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		89	101	232	300
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax		$ 847	$ 515	$ 2,502	$ 1,548

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $19,887 and $27,821 for the third quarter and first nine months of 2015 and $29,586 and $49,056 for the third quarter and first nine months of 2014, respectively.