Stock Plans Stock Plans (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, Beginning	4,835,438
Granted	3,598,963
Exercised	0
Forfeited	(2,931,841)
Options outstanding, Ending	5,502,560	4,835,438
Options exercisable, Ending	1,158,541
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, Beginning	$ 10.52
Granted	$ 9.19
Exercised	$ 0.00
Forfeited	$ 10.25
Options outstanding, Ending	$ 9.77	$ 10.52
Options exercisable, Ending	$ 12.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding January 3, 2015	8 years 6 months 11 days
Options exercisable January 3, 2015	6 years 5 months 8 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Nonvested, Beginning	85,600
Granted	62,982
Vested	(88,382)
Forfeited	(8,000)
Nonvested, Ending	52,200	85,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Beginning	$ 4.25
Granted	$ 5.61	$ 4.25	$ 4.25
Vested	$ 5.22
Forfeited	$ 4.25
Nonvested, Ending	$ 4.25	$ 4.25
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Annual risk-free rate	2.26%	1.99%	1.69%
Expected life of options (years)	8 years 2 months 1 day	7 years 2 months 8 days	8 years 3 months 8 days
Volatility	42.20%	52.30%	51.00%
Weighted average fair value of options granted per share	$ 1.95	$ 2.58	$ 1.74