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Stock-based Compensation (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant | 20,328,545 |  |  |
Stock-based compensation expense | $ 23,938,000 | $ 22,912,000 | $ 21,977,000 |
Proceeds from employee stock purchase plan | 4,868,000 | 2,187,000 | 568,000 |
Cash received from option exercises and purchases under the ESPP | $ 17,555,000 | $ 25,327,000 | 10,911,000 |
Options outstanding (in shares) | 22,208,446 | 24,999,665 |  |
Retirement Plan, employee contribution (as a percent) | 50.00% |  |  |
Employer matching contributions for first 3% of participant contributions (as a percent) | 100.00% |  |  |
Percentage of participant contributions into the 401(k) Retirement Plan (as a percent) | 3.00% |  |  |
Expenses relating to stock match | $ 1,700,000 | $ 1,100,000 | 400,000 |
Number of shares available for issuance under 401(k) Retirement Plan (in shares) | 231,090 |  |  |
Change in Control and Severance Benefit Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Termination period prior to change in control | 1 month |  |  |
Termination period subsequent to change in control | 13 months |  |  |
Change in Control and Severance Benefit Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Extension of exercise period | 1 year |  |  |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options, vesting period | 4 years |  |  | 10 years
Life of stock options granted | 7 years |  |  |
Total unrecognized compensation expense | $ 39,700,000 |  |  |
Unrecognized compensation expense weighted-average period for recognition | 2 years 6 months 25 days |  |  |
Intrinsic value of options exercised | $ 85,200,000 | 50,000,000 | 2,900,000 |
Cash received from option exercises and purchases under the ESPP | 17,600,000 | 25,300,000 | 10,900,000 |
Fair value of employee options vested and expensed | $ 13,100,000 | 13,400,000 | 18,900,000 |
RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options, vesting period | 4 years |  |  |
Total unrecognized compensation expense | $ 61,200,000 |  |  |
Unrecognized compensation expense weighted-average period for recognition | 3 years 2 months 12 days |  |  |
ESPP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant | 5,052,500 |  |  |
Discount rate from market value on purchase date (as a percent) | 85.00% |  |  |
Discount rate from market value on offering date (as a percent) | 85.00% |  |  |
Purchase period | 6 months |  |  |
Stock-based compensation expense | $ 1,600,000 | $ 1,000,000 | $ 400,000 |
Common stock issued (in shares) | 434,523 | 559,936 | 324,315 |
Average price per share (in dollars per share) | $ 11.20 | $ 3.91 | $ 1.75 |
Proceeds from employee stock purchase plan | $ 4,900,000 | $ 2,200,000 | $ 600,000 |
Performance Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 0 | $ 4,100,000 | $ 13,200,000 |
Number of options in vested (in shares) |  | 5,870,303 | 6,982,613 |
Options outstanding (in shares) | 0 |  |  |

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