2.2.0.7 true Employee Stock-Based Compensation (Details) (USD $) 0619 - Disclosure - Employee Stock-Based Compensation (Details) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 7 Employee Stock-Based Compensation (Textuals) [Abstract] 2 lll_EmployeeStockBasedCompensationTextualsAbstract lll false na duration Employee Stock Based Compensation Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string Employee Stock Based Compensation Textuals. false 16 Number of shares approved net of subsequent amendments for awards under the share-based compensation plan 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 12200000 12200000 false false false xbrli:sharesItemType shares The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a false 17 Equivalent number of shares for one common share issued under the full value award 2 lll_EquivalentNumberOfSharesForOneCommonSharesUnderFullValueAwardOption lll false na duration Each share of common stock issued under a full value award (awards other than stock options or stock appreciation rights)... false false false false false false false false false false false verboselabel false 1 false true false false 2.6 2.6 false false false 2 false false false false 0 0 false false false xbrli:sharesItemType shares Each share of common stock issued under a full value award (awards other than stock options or stock appreciation rights) will be counted as 2.6 shares for purposes of monitoring the share limit. No authoritative reference available. false 18 Maximum payout range for performance units 2 lll_MaximumPayoutRange lll false na duration Maximum payout range for performance units based on pre-determined performance goals established by the compensation... false false false false false false false false false false false verboselabel false 1 false true false false 2 2 false false false 2 false false false false 0 0 false false false xbrli:pureItemType pure Maximum payout range for performance units based on pre-determined performance goals established by the compensation committee. No authoritative reference available. false 19 Minimum payout range for performance units 2 lll_MinimumPayoutRange lll false na duration Minimum payout range for performance units based on pre-determined performance goals established by the compensation... false false false false false false false false false false false verboselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:pureItemType pure Minimum payout range for performance units based on pre-determined performance goals established by the compensation committee. No authoritative reference available. false 20 Restricted Stock Units [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/employeestockbasedcompensationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 3 USD true false false false Restricted Stock Units [Member] us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi lll_RestrictedStockUnitsMember us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 26 Employee Stock-Based Compensation (Textuals) [Abstract] 2 lll_EmployeeStockBasedCompensationTextualsAbstract lll false na duration Employee Stock Based Compensation Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string Employee Stock Based Compensation Textuals. false 31 Units granted during the period 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 603020 603020 false false false 2 false false false false 0 0 false false false xbrli:sharesItemType shares The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) false 32 Weighted average grant date fair value of units granted 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 90.24 90.24 false false false 2 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) false 33 Vesting period of units granted for employees 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 3 false false false 2 false false false false 0 0 false false false us-types:durationStringItemType normalizedstring Description of the estimated period of time over which an employee is required to provide service in exchange for the share-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a false 34 Vesting period of units granted for non-employee directors 2 lll_VestingPeriodOfUnitsGrantedForNonEmployeeDirectors lll false na duration Vesting period of units granted for non-employee directors. false false false false false false false false false false false verboselabel false 1 false true false false 1 1 false false false 2 false false false false 0 0 false false false xbrli:integerItemType integer Vesting period of units granted for non-employee directors. No authoritative reference available. false 39 Performance Units [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/employeestockbasedcompensationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 4 USD true false false false Performance Units [Member] us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi lll_PerformanceUnitsMember us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 45 Employee Stock-Based Compensation (Textuals) [Abstract] 2 lll_EmployeeStockBasedCompensationTextualsAbstract lll false na duration Employee Stock Based Compensation Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string Employee Stock Based Compensation Textuals. false 50 Units granted during the period 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 69918 69918 false false false 2 false false false false 0 0 false false false xbrli:sharesItemType shares The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) false 51 Weighted average grant date fair value of units granted 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 103.71 103.71 false false false 2 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) false 52 Vesting period of units granted for employees 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 3 false false false 2 false false false false 0 0 false false false us-types:durationStringItemType normalizedstring Description of the estimated period of time over which an employee is required to provide service in exchange for the share-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a false 58 Stock Options [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/employeestockbasedcompensationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 5 USD true false false false Stock Options [Member] us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_EmployeeStockOptionMember us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 59 Weighted average assumptions in valuation model 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 60 Expected holding period (in years) 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4.7 4.7 false false false 2 false false false false 0 0 false false false xbrli:decimalItemType decimal The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 false 61 Expected volatility 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.262 0.262 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) false 62 Expected dividend yield 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.022 0.022 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) false 63 Risk-free interest rate 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.023 0.023 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) false 64 Employee Stock-Based Compensation (Textuals) [Abstract] 2 lll_EmployeeStockBasedCompensationTextualsAbstract lll false na duration Employee Stock Based Compensation Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string Employee Stock Based Compensation Textuals. false 65 Stock options granted during the period 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 555363 555363 false false false 2 false false false false 0 0 false false false xbrli:sharesItemType shares The quantity of shares issuable on stock options awarded under the plan during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) false 66 Weighted average grant date fair value of stock options granted 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 18.41 18.41 false false false 2 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) false 67 Expiration period of stock options granted from date of grant 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 10 false false false 2 false false false false 0 0 false false false us-types:dateStringItemType normalizedstring Reflects the dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a false 68 Vesting period of stock options granted 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 3 false false false 2 false false false false 0 0 false false false us-types:durationStringItemType normalizedstring Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a false 2 27 false UnKnown NoRounding UnKnown false true