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Debt - Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt (Parenthetical) (Detail) (USD $)
 6 Months Ended
Jun. 27, 2014
Jun. 27, 2014
CODES Due 2035 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
3.95% Senior Notes due 2016 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
3.95% Senior Notes due 2016 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
1.50% Senior Notes due 2017 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
1.50% Senior Notes due 2017 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
5.20% Senior Notes due 2019 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
5.20% Senior Notes due 2019 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
4.75% Senior Notes due 2020 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
4.75% Senior Notes due 2020 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
4.95% Senior Notes due 2021 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
4.95% Senior Notes due 2021 [Member]
Jun. 27, 2014
L-3 Communications Corporation [Member]
3.95% Senior Notes due 2024 [Member]
Dec. 31, 2013
L-3 Communications Corporation [Member]
3.95% Senior Notes due 2024 [Member]
Jun. 27, 2014
L-3 Communications Holdings, Inc. [Member]
CODES Due 2035 [Member]
Dec. 31, 2013
L-3 Communications Holdings, Inc. [Member]
CODES Due 2035 [Member]
Debt Instrument [Line Items]                                
Interest rate on Senior Notes   3.00% 3.95% 3.95% 1.50% 1.50% 5.20% 5.20% 4.75% 4.75% 4.95% 4.95% 3.95% 3.95% 3.00% 3.00%
Aggregate borrowings and repayments under the Amended and Restated Revolving Credit Facility $ 1,031,000,000                              
Borrowings under Amended and Restated Revolving Credit Facility $ 1,000,000,000                              
Revolving credit facility expiration date Feb. 03, 2017