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L-3 Holdings' Earnings Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 26, 2014	Sep. 26, 2014	Sep. 27, 2013
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share and employee stock purchase plan contributions	0.6	0.5	1.2

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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