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Acquisitions (Narrative) (Details) (Elecsys Corporation [Member], USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Nov. 04, 2014	Nov. 30, 2014	Nov. 04, 2014
Elecsys Corporation [Member]
Business Acquisition [Line Items]
Acquisition date		Nov. 04, 2014
Acquisition price per share	$ 17.50us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = lnn_ElecsysCorporationMember		$ 17.50us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = lnn_ElecsysCorporationMember
Total purchase price	$ 70.5us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = lnn_ElecsysCorporationMember
Transaction costs		$ 0.6us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = lnn_ElecsysCorporationMember

X

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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X

- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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X

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

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