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L-3 Holdings' Earnings Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Earnings Per Share [Abstract]        
Shares excluded from computation of diluted earnings per share and employee stock purchase plan contributions 0.5 1.7 0.4 1.7