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Summary of Quarterly Information (Parenthetical) (Detail) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 16, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Sep. 25, 2016 | Dec. 31, 2015 | Sep. 27, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Net gain on divestiture of business segment |  |  |  |  |  |  | $ 1,242.0 |  |
Recognized tax benefit for the impact of the tax credit |  |  |  |  |  |  | $ 107.0 | $ 70.0 | $ 63.0
Workforce Reductions |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 67.0 | $ 15.0 |  |  |
Restructuring charges, after tax |  |  |  |  | 44.0 | $ 10.0 |  |  |
AWE Management Limited |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  | $ 307.0 | $ 103.0 |  |  |  |  |
Net earnings |  |  | $ 2.9 | $ 104.0 |  |  |  |  |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | $ 400.0 |  |  |  |  |  |  |
Net earnings |  | $ (45.0) |  |  |  |  |  |  |
Information Systems & Global Solutions |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Net gain on divestiture of business segment | $ 1,242.0 |  |  |  |  |  |  |  |
Tax Year 2015 |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Recognized tax benefit for the impact of the tax credit |  |  |  |  | $ 71.0 |  |  |  |

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