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Principles of Consolidation (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 13, 2016	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Apr. 13, 2017
Sale of GNU interest
Purchase price received				$ 250	$ 1,100
GNU gain on sale of business assets		$ 250	$ 3,836	$ 250	$ 3,836
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU
Sale of GNU interest
Purchase price receivable	$ 1,350					$ 250
Purchase price received	$ 1,100
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU
Sale of GNU interest
GNU gain on sale of business assets		250	3,800
GNU
GNU Interest
Percentage of ownership interest held by the entity				55.89%	55.89%
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU
Sale of GNU interest
GNU gain on sale of business assets		$ 140	$ 2,100

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

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-Topic 230
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