Summary of Significant Accounting Policies - Concentrations (Details)	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2015	Nov. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2015
Segment Reporting Information [Line Items]
Percentage of employees under collective bargaining agreements			14.00%
U.S. Government and agencies
Segment Reporting Information [Line Items]
Percentage of Net Sales	85.00%		92.00%	91.00%	90.00%
Net Sales | RS-25 program | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	10.00%		14.00%	12.00%	12.00%
Net Sales | Standard Missile program | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	12.00%		9.00%	12.00%	14.00%
Net Sales | THAAD program | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	13.00%		9.00%	13.00%	13.00%
Net Sales | Lockheed Martin Corp | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	24.00%	29.00%	24.00%	27.00%
Net Sales | ULA | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	28.00%	19.00%	22.00%	21.00%
Net Sales | Raytheon Company | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	19.00%	20.00%	17.00%	20.00%
Net Sales | NASA | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage	10.00%	11.00%	17.00%	13.00%
Accounts Receivable | Lockheed Martin Corp | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage			12.00%	17.00%
Accounts Receivable | ULA | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage			11.00%	20.00%
Accounts Receivable | Raytheon Company | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage			16.00%	17.00%
Accounts Receivable | NASA | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage			11.00%	14.00%
Accounts Receivable | Boeing | Customer Concentration Risk
Segment Reporting Information [Line Items]
Risk percentage			35.00%	13.00%