Goodwill and Intangible Assets - Finite-lived Intangible Asset Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 30, 2016	Dec. 25, 2015
Finite-lived intangible assets
Impairment of intangible assets	$ 0
Power EPC \| Tradename
Finite-lived intangible assets
Impairment of intangible assets		$ 9,100

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Name:	us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration