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Inventories (Schedule Of Estimated Percentage Distribution) (Details)	May 31, 2012	Aug. 31, 2011	May 31, 2011
Inventories [Abstract]
Raw materials	15.00%	14.00%	14.00%
Work in process	9.00%	8.00%	9.00%
Finished goods and purchased parts	76.00%	78.00%	77.00%

X

- Definition

Estimated percentage distribution of inventory before reserves, finished goods and purchased parts

+ References

No definition available.

+ Details

Name:	lnn_FinishedGoodsAndPurchasedParts
Namespace Prefix:	lnn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Estimated percentage distribution of inventory before reserves, raw materials

+ References

No definition available.

+ Details

Name:	lnn_RawMaterials
Namespace Prefix:	lnn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Estimated percentage distribution of inventory before reserves, work in process

+ References

No definition available.

+ Details

Name:	lnn_WorkInProgress
Namespace Prefix:	lnn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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