Stockholders' Equity - Weighted Average Assumptions for Fair Value of Options Granted (Details)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Weighted average assumptions for fair value of options granted
Average risk free interest rate	1.83%	1.33%	1.38%
Expected life (in years)	4 years 6 months 18 days	4 years 6 months 18 days	4 years 6 months 18 days
Average volatility	41.80%	44.50%	49.30%