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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015 segment	Feb. 28, 2014	Aug. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments			2us-gaap_NumberOfReportableSegments
Total operating revenues	$ 141,089,000us-gaap_Revenues	$ 152,804,000us-gaap_Revenues	$ 275,934,000us-gaap_Revenues	$ 300,475,000us-gaap_Revenues
Segment operating income	19,216,000lnn_SegmentOperatingIncomeLoss	24,554,000lnn_SegmentOperatingIncomeLoss	36,129,000lnn_SegmentOperatingIncomeLoss	45,373,000lnn_SegmentOperatingIncomeLoss
Unallocated general and administrative expenses	(4,680,000)lnn_UnallocatedGeneralAndAdministrativeExpenses	(3,641,000)lnn_UnallocatedGeneralAndAdministrativeExpenses	(9,691,000)lnn_UnallocatedGeneralAndAdministrativeExpenses	(8,468,000)lnn_UnallocatedGeneralAndAdministrativeExpenses
Interest and other expense, net	(398,000)lnn_InterestAndOtherExpenses	(124,000)lnn_InterestAndOtherExpenses	(639,000)lnn_InterestAndOtherExpenses	(299,000)lnn_InterestAndOtherExpenses
Earnings before income taxes	14,138,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20,789,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	25,799,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	36,606,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Capital Expenditures	2,927,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	2,966,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	6,576,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	5,353,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Depreciation and Amortization	4,269,000us-gaap_OtherDepreciationAndAmortization	3,677,000us-gaap_OtherDepreciationAndAmortization	8,017,000us-gaap_OtherDepreciationAndAmortization	7,384,000us-gaap_OtherDepreciationAndAmortization
Environmental remediation expenses					7,200,000us-gaap_EnvironmentalRemediationExpense
Irrigation [Member]
Segment Reporting Information [Line Items]
Number of operating segments			4us-gaap_NumberOfOperatingSegments / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Total operating revenues	108,331,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	135,884,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	223,047,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	265,067,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Segment operating income	11,942,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	24,548,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	26,611,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	44,859,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Capital Expenditures	2,381,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	2,709,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	5,465,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	4,937,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Depreciation and Amortization	3,039,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	2,341,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	5,525,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	4,699,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Environmental remediation expenses			1,300,000us-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	32,758,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	16,920,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	52,887,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	35,408,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Segment operating income	7,274,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	6,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	9,518,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	514,000lnn_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Capital Expenditures	546,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	257,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	1,111,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	416,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Depreciation and Amortization	1,230,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	1,336,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	2,492,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	2,685,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember
Environmental remediation expenses			$ 200,000us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember

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