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INFORMATION ON BUSINESS SEGMENTS - Narrative (Details) - segment | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2017 | Sep. 25, 2016 | Sep. 24, 2017 | Sep. 25, 2016
Segment Reporting [Abstract] |  |  |  |
Number of business segments |  |  | 4 |
Product Concentration Risk | Sales Revenue, Net | F-35 program | Aeronautics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales for the F-35 program representing total consolidated net sales (as a percent) | 26.00% | 23.00% | 25.00% | 23.00%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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