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Financial Derivatives (Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) (Foreign Currency Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Foreign Currency Forward Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Amount of Gain/(Loss) Recognized in OCI on Derivatives $ 1,145us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
$ (695)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Foreign currency forward contracts, tax expense (benefit) $ 733lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
$ (403)lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember