Discontinued Operations (Environmental Remediation) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Environmental Remediation Obligations [Abstract]
Accrual for Environmental Loss Contingencies	$ 1,753	$ 1,746

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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