Income Taxes Domestic and foreign components of (loss) income before income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2018	Jan. 03, 2017	Dec. 29, 2015
Income Tax Examination [Line Items]
Domestic and foreign components of (loss) income before income taxes	$ (37,689)	$ (70,444)	$ (22,499)
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Domestic and foreign components of (loss) income before income taxes	(42,047)	(67,626)	(21,674)
Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Domestic and foreign components of (loss) income before income taxes	$ 4,358	$ (2,818)	$ (825)