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L-3 Holdings' Earnings Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Earnings Per Share [Abstract]    
Shares excluded from computation of diluted earnings per share and employee stock purchase plan contributions 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount