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Share-Based Compensation - RSUs activity under the long-term incentive plan (Details) - Restricted stock units [Member] |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2020 | Sep. 26, 2018 | Sep. 29, 2017 | Sep. 28, 2016 | Sep. 25, 2015 | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |
Number of Shares, Balance |  |  |  |  |  | 18,493 | 60,338 | 92,600
Number of Shares, Granted | 1,402,714 | 676,273 | 580,235 | 1,208,785 | 597,596 | 1,402,714 |  | 676,273
Number of Shares, Vested |  |  |  |  |  | (1,392,355) | (38,878) | (698,427)
Number of Shares, Forfeited |  |  |  |  |  | (5,963) | (2,967) | (10,108)
Number of Shares, Balance |  |  |  |  |  | 22,889 | 18,493 | 60,338
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement at beginning of period |  |  |  |  |  | $ 7.34 | $ 7.98 | $ 8.77
Weighted average exercise price of other equity instruments granted in share-based payment arrangement |  |  |  |  |  | 3.44 |  | 5.76
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement |  |  |  |  |  | 3.47 | 8.29 | 5.92
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement |  |  |  |  |  | 6.57 | 7.98 | 8.55
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement at end of period |  |  |  |  |  | $ 3.88 | $ 7.34 | $ 7.98

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