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Credit Arrangements (Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Debt Instrument [Line Items]  
Long-term debt $ 117,462us-gaap_LongTermDebt
Less current portion (192)us-gaap_LongTermDebtCurrent
Total long-term debt 117,270us-gaap_LongTermDebtNoncurrent
Series 2006A Bonds [Member]  
Debt Instrument [Line Items]  
Long-term debt 2,462us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lnn_Series2006aBondsMember
Senior Notes [Member]  
Debt Instrument [Line Items]  
Long-term debt $ 115,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember