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Employee Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 20, 2020 | Jan. 01, 2021 | Jan. 03, 2020 | Dec. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant |  | 17,100,727 |  |
Reduction in share reserve after stock option or stock appreciation award (in shares) |  | 1 |  |
Reduction in share reserve after all other awards (in shares) |  | 1.5 |  |
Increase in share reserve under 2017 plan (in shares) | 21,000,000 |  |  |
Total stock-based compensation expense |  | $ 105,070 | $ 56,602 | $ 40,626
Stock options granted (in shares) |  | 1,637,000 |  |
Expenses relating to stock match |  | $ 6,700 | 4,600 | 3,600
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  | 7 years |  |
Total stock-based compensation expense |  | $ 19,863 | 23,422 | 18,896
Total unrecognized compensation expense |  | $ 27,100 |  |
Unrecognized compensation expense weighted-average period for recognition |  | 2 years 3 months 18 days |  |
Intrinsic value of options exercised |  | $ 106,500 | 54,100 | 39,100
Cash received from option exercises and purchases under the ESPP |  | $ 26,900 | 16,400 | 12,100
Stock options | Share-based Payment Arrangement, Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 4 years |  |
Stock options | Share-based Payment Arrangement, Nonemployee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 1 year |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense |  | $ 35,675 | $ 26,056 | 19,569
Total unrecognized compensation expense |  | $ 103,600 |  |
Unrecognized compensation expense weighted-average period for recognition |  | 3 years |  |
Instruments awarded (in shares) |  | 3,053,000 |  |
Number of awards (in shares) |  | 5,378,000 | 4,422,000 |
Restricted stock units | Share-based Payment Arrangement, Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 4 years |  |
Restricted stock units | Share-based Payment Arrangement, Nonemployee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 1 year |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant |  | 3,704,580 |  |
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 |  |
Total stock-based compensation expense |  | $ 2,426 | $ 2,246 | $ 2,161
Common stock issued (in shares) |  | 534,419 | 483,009 | 330,492
Average price per share (in dollars per share) |  | $ 14.55 | $ 12.60 | $ 15.74
Proceeds from employee stock purchase plan |  | $ 7,800 | $ 6,100 | $ 5,200
Performance Share Options (PSO) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) |  |  |  | 308,365
Exercise threshold, percentage of per share exercise price of the PSO |  |  |  | 125.00%
Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense |  | $ 47,106 | $ 4,878 | $ 0
Unrecognized compensation expense weighted-average period for recognition |  | 3 years 6 months |  |
Instruments awarded (in shares) |  | 4,656,000 | 1,926,605 | 693,131
Employees percentage |  | 200.00% | 200.00% |
Additional shares to be earned (in shares) |  | 4,655,680 | 1,926,605 |
Number of awards (in shares) |  | 7,378,000 | 4,379,000 |
Performance stock units | Achieved |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of awards (in shares) |  | 3,206,897 |  |
Performance stock units | Probable |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation expense |  | $ 11,800 |  |
Performance stock units | Not Probable |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation expense |  | $ 128,500 |  |
Performance Shares, Clinical Trial Results |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Instruments awarded (in shares) |  | 2,327,840 |  |
Performance Shares, Achieved Before December 31, 2020 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employees percentage |  |  | 150.00% |
Performance Shares, Achieved Before December 31, 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employees percentage |  |  | 50.00% |

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