Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
	Mar. 10, 2015 $ / shares shares	Oct. 03, 2015	Jan. 02, 2016 USD ($) plan $ / shares shares	Jan. 03, 2015 USD ($) tranch $ / shares shares	Dec. 28, 2013 USD ($) $ / shares shares	May. 31, 2012 shares
Class of Stock [Line Items]
Equity Incentive Plans, Number | plan			4
Compensation expense | $			$ 21,643	$ 12,802	$ 9,522
Total unrecognized compensation cost related to unvested employee and director stock options | $			$ 10,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares			$ 5.46	$ 5.45
Options, Outstanding, Number			11,444,000	9,369,000
Share-based Compensation, Cash Used to Settle Awards | $			$ 3,900
Total intrinsic value of options exercised | $			2,500	$ 7,800	2,500
Total fair value of options and RSU's vested and expensed | $			$ 18,000	$ 12,800	$ 9,300
Grant date weighted average fair values based on fair value assumptions, options | $ / shares			$ 2.35	$ 2.93	$ 2.10
Granted			2,348,000
Award Requisite Service Period			2 years
Comparison period			2 years
1996 Stock Incentive Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			0
2001 Stock Incentive Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			0
ESPP
Class of Stock [Line Items]
Number of shares authorized			5,200,000.0
Share-based Compensation Conversion Ratio	1.098160
Grant date weighted average fair values based on fair assumptions, non-options | $ / shares			$ 1.51	$ 1.73	$ 1.29
ESPP | 2012 ESPP
Class of Stock [Line Items]
Number of shares authorized			2,300,000.0			3,000,000
Percentage of employee's compensation maximum for employee share purchases			10.00%
Purchase price of shares as percentage of fair market value			85.00%
Stock options
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Options, Outstanding, Number	2,087,605		1,622,007
Weighted average period for recognition			4 years 2 months
Performance Shares
Class of Stock [Line Items]
Compensation expense | $			$ 600
Granted			327,200		0
Options, Nonvested, Number of Shares			327,200
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Compensation expense | $				$ 700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 7.30
Options, Outstanding, Number	2,025,255		1,056,368
Unrecognized compensation expense related to unvested RSU's | $			$ 24,400
Grant date weighted average fair values based on fair assumptions, non-options | $ / shares			$ 5.92
Granted			70,000	98,600	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Number of Tranches | tranch				2
Options, Nonvested, Number of Shares			70,000
Maximum
Class of Stock [Line Items]
Award Requisite Service Period		10 years
Maximum | ESPP | 2012 ESPP
Class of Stock [Line Items]
Compensation expense | $			$ 400	$ 300	$ 200
Maximum | Performance Shares
Class of Stock [Line Items]
Award Vesting Rights, Percentage			200.00%
Minimum | Performance Shares
Class of Stock [Line Items]
Award Vesting Rights, Percentage			0.00%