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Restructuring and Asset Impairment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016 | Dec. 31, 2018 | Nov. 08, 2017 | Jul. 01, 2017 | Dec. 31, 2016 | Jun. 25, 2016 | Dec. 26, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and retention costs liability | $ 3,806 | $ 5,372 | $ 3,806 | $ 5,372 |  |  | $ 4,004 | $ 3,680 | $ 3,678 | $ 2,969
Impairment charges | 100 | 4,300 | 300 | 4,300 |  |  |  |  |  |
Accelerated depreciation | 100 | 100 | 200 | 500 |  |  |  |  |  |
Other restructuring costs |  | $ 800 | 400 | $ 800 |  |  |  |  |  |
Accrued Compensation |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and retention costs liability | $ 3,400 |  | $ 3,400 |  |  |  |  |  |  |
Subsequent Event | RMS | Minimum |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Expected restructuring costs |  |  |  |  |  | $ 18,000 |  |  |  |
Subsequent Event | RMS | Maximum |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Expected restructuring costs |  |  |  |  |  | $ 24,000 |  |  |  |
Subsequent Event | RMS | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  | $ 17,000 |  |  |  |  |
Accelerated lease obligations |  |  |  |  | 5,000 |  |  |  |  |
Payments for restructuring |  |  |  |  | $ 6,000 |  |  |  |  |

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