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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

X

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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