Restructuring and Other Charges (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 2,042	$ 13,784
Accounts Payable and Accrued Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,783
Other Long Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 259