Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2018	Oct. 03, 2017	Oct. 02, 2018	Oct. 03, 2017	Jan. 02, 2018	Jul. 04, 2017	Feb. 08, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Document Period End Date			Oct. 02, 2018
Net Income (Loss) Available to Common Stockholders, Basic	$ 1,050	$ (8,335)	$ (8,460)	$ (44,962)
Net loss	$ 1,050	$ (8,335)	$ (8,460)	$ (36,995)
Shares:
Basic weighted average shares outstanding (in shares)	43,094,524	41,109,827	41,798,640	36,639,382
Effect of dilutive securities (in shares)	1,734,839	0	0	0
Diluted weighted average number of shares outstanding (in shares)	44,829,363	41,109,827	41,798,640	36,639,382
Earnings (loss) per share:
Basic loss per share (USD per share)	$ 0.02	$ (0.20)	$ (0.20)	$ (1.23)
Diluted loss per share (USD per share)	$ 0.02	$ (0.20)	$ (0.20)	$ (1.23)
Preferred stock, shares issued (in shares)	0		0		0
Antidilutive securities excluded from computation of earnings per share	176,325	4,575,537	2,758,848	7,031,639
L Catterton | Preferred Stock
Earnings (loss) per share:
Preferred stock, shares issued (in shares)						18,500	18,500