Stockholders' Equity (Employee and Director Stock Options, Restricted Stock and ESPP) (Details 2) (USD $)	12 Months Ended
	Dec. 28, 2013 population	Dec. 29, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employee populations for fair value assumptions	2
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total unrecognized compensation cost related to unvested employee and director stock options	$ 10,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance	9,528,000
Granted	3,167,000
Exercised	(990,000)
Forfeited or expired	(1,264,000)
Ending balance	10,441,000	9,528,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance	$ 4.74
Granted	$ 5.01
Exercised	$ 2.38
Forfeited or expired	$ 6.09
Ending balance	$ 4.88	$ 4.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested and expected to vest at end of period, Shares	10,441,000
Vested and expected to vest at end of period, Weighted average exercise price	$ 4.88
Vested and expected to vest at end of period, Weighted average remaining contractual term	4 years 9 months 18 days
Vested and expected to vest at end of period, aggregate intrinsic value	8,220,000
Exercisable at end of period, Shares	5,323,000
Exercisable at end of period, Weighted average exercise price	$ 4.46
Exercisable at end of period, Weighted average remaining contractual term	3 years 9 months 22 days
Exercisable at end of period, aggregate intrinsic value	6,450,000
Total intrinsic value of options exercised	2,500,000	3,400,000	6,600,000
Total fair value of options and RSU's vested and expensed	9,300,000	7,400,000	6,000,000
Grant date weighted average fair values based on fair value assumptions, options	$ 2.10	$ 2.74	$ 2.92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares of common stock available for future purchases under ESPP	2,800,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility, percent, minimum	51.40%	58.10%	57.40%
Expected volatility, percent, maximum	54.30%	59.50%	61.90%
Risk-free interest rate, percent, minimum	0.007%	0.006%	0.003%
Risk-free interest rate, percent, maximum	0.01%	0.01%	0.02%
Dividend yield	0.00%	0.00%	0.00%
Weighted average period for recognition	4 years 10 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares of common stock available for future grants	6,800,000
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	4 years 1 month 2 days	4 years 1 month 2 days	4 years 0 months 18 days
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term		4 years 5 months 19 days	4 years 4 months 13 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	6 months	6 months	6 months
Dividend yield	0.00%	0.00%	0.00%
Weighted average expected volatility rate (percent)	48.00%	50.00%	48.10%
Weighted average risk-free interest rate (percent)	0.11%	0.12%	0.14%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Grant date weighted average fair values based on fair assumptions, non-options	$ 1.29	$ 1.35	$ 1.80
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Granted, Weighted average grant date fair value	$ 1.29	$ 1.35	$ 1.80
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Grant date weighted average fair values based on fair assumptions, non-options	$ 5.22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of period, Shares	1,078,000
Granted, Shares	1,735,000
Vested, Shares	(524,000)
Forfeited, Shares	(99,000)
Balance at the end of period, Shares	2,190,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Balance at the beginning of period, Weighted average grant date fair value	$ 6.15
Granted, Weighted average grant date fair value	$ 5.22
Vested, Weighted average grant date fair value	$ 5.91
Forfeited, Weighted average grant date fair value	$ 5.68
Balance at the end of period, Weighted average grant date fair value	$ 5.49
Unrecognized compensation expense related to unvested RSU's	$ 9,500,000