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Financial Derivatives (Narrative) (Details) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended							3 Months Ended		6 Months Ended
	Feb. 28, 2015 USD ($)	Feb. 28, 2014 USD ($)	Aug. 31, 2014 USD ($)	Feb. 28, 2015 Euro [Member] EUR (€)	Aug. 31, 2014 Euro [Member] EUR (€)	Feb. 28, 2014 Euro [Member] EUR (€)	Feb. 28, 2015 Rand [Member] ZAR	Aug. 31, 2014 Rand [Member] ZAR	Feb. 28, 2014 Rand [Member] ZAR	Feb. 28, 2015 Foreign Currency Forward Contracts [Member] USD ($)	Feb. 28, 2014 Foreign Currency Forward Contracts [Member] USD ($)	Feb. 28, 2015 Foreign Currency Forward Contracts [Member] USD ($)	Feb. 28, 2014 Foreign Currency Forward Contracts [Member] USD ($)	Aug. 31, 2014 Foreign Currency Forward Contracts [Member] USD ($)
Derivatives, Fair Value [Line Items]
Realized and unrealized gains included in AOCI	$ 5.2lnn_DerivativeInstrumentsRealizedAndUnrealizedGainLossIncludedInAccumulatedOtherComprehensiveIncomeNet	$ 1.1lnn_DerivativeInstrumentsRealizedAndUnrealizedGainLossIncludedInAccumulatedOtherComprehensiveIncomeNet	$ 2.0lnn_DerivativeInstrumentsRealizedAndUnrealizedGainLossIncludedInAccumulatedOtherComprehensiveIncomeNet
Derivative contracts resulting in an after-tax net gain (loss)										0.9us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	(0.4)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	1.8us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	(0.9)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Outstanding foreign currency forward contracts to sell				€ 29.0invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_EUR	€ 28.9invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_EUR	€ 28.9invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_EUR	43.0invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_ZAR	43.0invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_ZAR	43.0invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_ZAR	$ 5.8invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 5.2invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 5.8invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 5.2invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember	$ 4.9invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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X

- Definition

Derivative Instruments, Realized And Unrealized Gain (Loss) Included In Accumulated Other Comprehensive Income, Net

+ References

No definition available.

+ Details

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X

- Definition

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900



Reference 2: 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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