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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	May 31, 2014	Feb. 28, 2013
Subsequent Event [Line Items]
Contract amount		$ 39
Potential account receivable for obligations not yet completed	2.6
Accounts receivable outstanding	2.5
Possible loss amount	4.4
Performance Bond Obligation [Member]
Subsequent Event [Line Items]
Possible loss amount	1.9
Collectibility Of Receivables [Member]
Subsequent Event [Line Items]
Possible loss amount	$ 2.5

X

- Definition

Contract Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	lnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Potential Account Receivable For Obligations Not Yet Completed

+ References

No definition available.

+ Details

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Namespace Prefix:	lnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.

+ 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 210.5-02.3(c))

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c

-Article 5

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Balance Type:	debit
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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration