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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Nov. 30, 2014 segment		Nov. 30, 2013		Aug. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	2us-gaap_NumberOfReportableSegments
Total operating revenues	$ 134,845us-gaap_Revenues		$ 147,671us-gaap_Revenues
Segment operating income	16,913lnn_SegmentOperatingIncomeLoss	[1]	20,819lnn_SegmentOperatingIncomeLoss	[1]
Unallocated general and administrative expenses	(5,011)lnn_UnallocatedGeneralAndAdministrativeExpenses		(4,827)lnn_UnallocatedGeneralAndAdministrativeExpenses
Interest and other income (expense), net	(241)us-gaap_InterestAndOtherIncome		(175)us-gaap_InterestAndOtherIncome
Earnings before income taxes	11,661us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		15,817us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Capital Expenditures	3,649us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		2,387us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Depreciation and Amortization	3,748us-gaap_OtherDepreciationAndAmortization		3,707us-gaap_OtherDepreciationAndAmortization
Environmental remediation expenses			0us-gaap_EnvironmentalRemediationExpense		7,200us-gaap_EnvironmentalRemediationExpense
Irrigation [Member]
Segment Reporting Information [Line Items]
Number of operating segments	4us-gaap_NumberOfOperatingSegments / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Total operating revenues	114,716us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember		129,183us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Segment operating income	14,669lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	[1]	20,311lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	[1]
Capital Expenditures	3,084us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember		2,228us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Depreciation and Amortization	2,486us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember		2,358us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Environmental remediation expenses	1,300us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Infrastructure [Member]
Segment Reporting Information [Line Items]
Number of operating segments	1us-gaap_NumberOfOperatingSegments / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Total operating revenues	20,129us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember		18,488us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Segment operating income	2,244lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	[1]	508lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	[1]
Capital Expenditures	565us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember		159us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Depreciation and Amortization	1,262us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember		1,349us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Environmental remediation expenses	$ 200us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
[1] Environmental remediation expenses of $1.3 million and $0.2 million were allocated to the irrigation segment and infrastructure segment, respectively, for the three months ended November 30, 2014. There were no environmental remediation expenses for the three months ended November 30, 2013.

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