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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		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivatives	$ 2,068us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ (245)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 3,213us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ (940)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Foreign currency forward contracts, tax expense (benefit)	$ 1,315lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ (196)lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 2,048lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ (599)lnn_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeTaxExpenseBenefit / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember

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- Definition

Derivative Instruments Gain Loss Recognized In Other Comprehensive Income, Tax Expense Benefit

+ References

No definition available.

+ Details

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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