Reorganization and Realignment Costs G&A Realignment - May 2017 Plan Accrual Rollforward (Details) - G&A Realignment – May 2017 Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Restructuring Cost and Reserve
Beginning balance			$ 12,270	$ 0
Charges	$ 2,016	$ 13,551	4,551	13,551
Payments for Restructuring			(6,729)	(753)
Ending balance	10,092	12,798	10,092	12,798
Severance and related employee costs
Restructuring Cost and Reserve
Beginning balance			12,093	0
Charges	1,052	13,226	3,111	13,226
Payments for Restructuring			(5,326)	(507)
Ending balance	9,878	12,719	9,878	12,719
Recruitment and relocation costs
Restructuring Cost and Reserve
Beginning balance			177	0
Charges	360	0	508	0
Payments for Restructuring			(471)	0
Ending balance	214	0	214	0
Third-party and other costs
Restructuring Cost and Reserve
Beginning balance			0	0
Charges	604	325	932	325
Payments for Restructuring			(932)	(246)
Ending balance	0	$ 79	0	$ 79
Accrued expenses and other current liabilities
Restructuring Cost and Reserve
Ending balance	7,985		7,985
Other Liabilities
Restructuring Cost and Reserve
Ending balance	$ 2,107		$ 2,107