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Inventories (Schedule Of Estimated Percentage Distribution) (Details) | May 31, 2012 | Aug. 31, 2011 | May 31, 2011
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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%

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- 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

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- 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

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