Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Goodwill - Narrative (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 31, 2019	Oct. 08, 2019
Goodwill [Line Items]
Goodwill	$ 170,830	$ 170,917
Nobles Worldwide, Inc.
Goodwill [Line Items]
Goodwill			$ 34,850
Electronic Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	44.00%
Goodwill	$ 117,435	117,435
Structural Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	85.00%
Goodwill	$ 53,395	$ 53,482
Structural Systems \| Nobles Worldwide, Inc.
Goodwill [Line Items]
Goodwill			$ 34,900