Goodwill (Details)	9 Months Ended	11 Months Ended
Sep. 30, 2021 USD ($) reportingUnit	Dec. 31, 2020 USD ($)
Goodwill [Line Items]
Number of reporting units \| reportingUnit	3
Goodwill [Roll Forward]
Beginning balance of goodwill	$ 52,711,000	$ 0
Change arising from impact of foreign currency	(187,000)	344,000
Ending balance of goodwill	69,625,000	52,711,000
Oakman
Goodwill [Roll Forward]
Goodwill arising from acquisition	6,866,000
Measurement period adjustment - acquisition	1,951,000
Ending balance of goodwill	8,817,000
DPSS
Goodwill [Roll Forward]
Goodwill arising from acquisition	10,904,000
Measurement period adjustment - acquisition	88,000
Ending balance of goodwill	10,992,000
DSS
Goodwill [Roll Forward]
Goodwill arising from acquisition		3,984,000
Measurement period adjustment - acquisition	(85,000)
Ending balance of goodwill	3,899,000
MIS
Goodwill [Roll Forward]
Goodwill arising from acquisition		15,320,000
Measurement period adjustment - acquisition	(512,000)
Ending balance of goodwill	14,808,000
Roccor
Goodwill [Roll Forward]
Goodwill arising from acquisition		6,725,000
Measurement period adjustment - acquisition	(684,000)
Ending balance of goodwill	6,041,000
Adcole
Goodwill [Roll Forward]
Goodwill arising from acquisition		21,525,000
LoadPath
Goodwill [Roll Forward]
Goodwill arising from acquisition		$ 4,813,000
Measurement period adjustment - acquisition	(1,427,000)
Ending balance of goodwill	3,386,000
Mission Solutions Reporting Unit
Goodwill [Line Items]
Goodwill impairment	0
Space Components Reporting Unit
Goodwill [Line Items]
Goodwill impairment	0
Engineering Services Reporting Unit
Goodwill [Line Items]
Goodwill impairment	$ 0

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.

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