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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