Operating Segments and Related Disclosures - Summary of Customers that Represented More than 10% of Net Sales (Details) - Customers - Sales Revenue, Net	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Percentage of net sales	29.00%	24.00%	29.00%	21.00%
United Launch Alliance
Revenue, Major Customer [Line Items]
Percentage of net sales	19.00%	23.00%	19.00%	23.00%
NASA
Revenue, Major Customer [Line Items]
Percentage of net sales	19.00%	18.00%	18.00%	18.00%
Raytheon Company
Revenue, Major Customer [Line Items]
Percentage of net sales	15.00%	14.00%	18.00%	16.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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