Reorganization and Realignment Costs G&A Realignment Accrual Rollforward (Details) - General and Administrative Realignment and Reinvestment [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Restructuring Reserve [Roll Forward]
Beginning balance			$ 3,575	$ 11,763
Charges	$ 38	$ 785	971	4,429
Payments			(3,671)	(10,542)
Ending balance	875	5,650	875	5,650
Severance and related employee costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			3,431	11,609
Charges	0	513	11	3,132
Payments			(2,642)	(9,256)
Ending balance	800	5,485	800	5,485
Recruitment and relocation costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			144	149
Charges	29	270	922	1,254
Payments			(991)	(1,238)
Ending balance	75	165	75	165
Other [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			0	5
Charges	9	2	38	43
Payments			(38)	(48)
Ending balance	$ 0	$ 0	$ 0	$ 0