Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Thousands							12 Months Ended
	Jul. 31, 2018	May 24, 2018	Apr. 03, 2017	Mar. 13, 2017	Feb. 09, 2017	Feb. 08, 2017	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017	Apr. 12, 2017	Apr. 04, 2017
Class of Stock [Line Items]
Shares authorized							181,000,000
Common stock, shares authorized							180,000,000	180,000,000
Common stock, par value							$ 0.01	$ 0.01
Preferred stock, shares authorized							1,000,000	1,000,000
Preferred stock, par value							$ 0.01	$ 0.01
Loss recognized in operations							$ 200
Preferred stock, shares issued							0	0
Shares Issued upon Conversion (shares)											18,500
Issuance of common stock, net of transaction expenses							$ 22,992	$ 29,110	$ 0
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized							150,000,000
Common stock, par value							$ 0.01
Sale of Stock, Number of Shares Issued in Transaction	2,500,000
Sale of Stock, Price Per Share	$ 10.00
Issuance of common stock, net of transaction expenses	$ 23,000
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized							30,000,000
Common stock, par value		$ 0.01					$ 0.01
Shares converted (in shares)		1,522,098
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized							1,000,000
Preferred stock, par value							$ 0.01
Equity Sponsors [Member] | Minimum
Class of Stock [Line Items]
Registration rights, percentage of common stock shares							10.00%
L Catterton [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Private Placement, Net					$ 16,600
Payments for Repurchase of Private Placement					$ 1,900
L Catterton [Member] | Common Stock [Member] | Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock, par value						$ 0.01
Shares Issued upon Conversion (shares)						4,252,873				4,252,873
Sale of Stock, Price Per Share						$ 1,000
L Catterton [Member] | Preferred Stock [Member]
Class of Stock [Line Items]
Proceeds from issuance of private placement						$ 18,500
Preferred stock, shares issued						18,500
Mill Road Capital II, L.P. [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Private Placement, Net			$ 29,100
Payments for Repurchase of Private Placement			$ 2,400
Mill Road Capital II, L.P. [Member] | Class A Common Stock [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction				8,873,240
Mill Road Capital II, L.P. [Member] | Common Stock [Member] | Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock, par value				$ 0.01
Sale of Stock, Price Per Share				$ 3.55
Mill Road Capital II, L.P. [Member] | Preferred Stock [Member]
Class of Stock [Line Items]
Proceeds from issuance of private placement				$ 31,500
Common Stock [Member] | L Catterton [Member] | Warrant [Member]
Class of Stock [Line Items]
Shares to be issued (shares)						1,913,793
Share price (USD per share)						$ 4.35
Fair Value, Inputs, Level 2 | L Catterton [Member]
Class of Stock [Line Items]
Temporary Equity, Accretion of Dividends								$ 8,000
Fair Value Adjustment of Warrants						$ 3,100
Debt Instrument, Convertible, Beneficial Conversion Feature						$ 3,100