Earnings Per Share - Dilutive effects of share based awards (Details) - shares |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Sep. 28, 2017 |
Sep. 29, 2016 |
Sep. 28, 2017 |
Sep. 29, 2016 |
Dec. 29, 2016 |
Dec. 31, 2015 |
Dec. 25, 2014 |
|
| Stock options | |||||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||||
| Anti-dilutive shares excluded from the computation of diluted earnings (per share) | 11,664 | 1,903,466 | 717,685 | 2,332,976 | 2,003,651 | 1,856,579 | 1,536,690 |