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Acquisitions (Schedule Of Consideration Paid And Amounts Of Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 0 Months Ended
Feb. 28, 2015
Jan. 22, 2015
Aug. 31, 2014
Feb. 28, 2014
Business Acquisition [Line Items]        
Goodwill $ 74,808us-gaap_Goodwill   $ 37,021us-gaap_Goodwill $ 37,282us-gaap_Goodwill
Total cash consideration, net of cash acquired 67,176us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Elecsys Corporation [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents   3,401us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Receivables   2,006us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Inventories   8,467us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Other current assets   1,527us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Property and equipment   6,457us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Intangible assets   24,850us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Goodwill   38,791us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Other long-term assets   41us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Accounts payable and accrued liabilities   (2,762)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Current and long-term debt   (2,478)lnn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermAndLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Other long-term liabilities   (9,723)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Total cash consideration   70,577us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Less cash acquired   (3,401)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Total cash consideration, net of cash acquired   67,176us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Add current and long-term debt assumed   2,478lnn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermAndLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember
   
Total purchase price   $ 69,654us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lnn_ElecsysCorporationMember