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Industry Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2014	Aug. 31, 2014	Nov. 30, 2013
Segment Reporting Information [Line Items]
Assets	$ 490,077us-gaap_Assets	$ 526,551us-gaap_Assets	$ 521,703us-gaap_Assets
Irrigation [Member]
Segment Reporting Information [Line Items]
Assets	368,577us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	407,447us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember	395,981us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_IrrigationMember
Infrastructure [Member]
Segment Reporting Information [Line Items]
Assets	$ 121,500us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	$ 119,104us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember	$ 125,722us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lnn_InfrastructureMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lnn_InfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lnn_IrrigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: