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Note 11 - Geographic And Segment Information (Detail) - Net Sales By Geographic Location as a Percentage of Total Consolidated Net Sales: | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012
Net Sales, Percentage | 100.00% | 100.00% | 100.00% | 100.00%
Inside the U.S.A to Unaffiliated Customers [Member] |  |  |  |
Net Sales, Percentage | 65.60% | 58.90% | 68.40% | 63.30%
Joint Ventures In Which The Company Is A Shareholder Directly And Indirectly - Outside the U.S.A [Member] |  |  |  |
Net Sales, Percentage | 18.20% | 11.90% | 16.80% | 13.70%
Unaffiliated Customers - Outside the U.S.A [Member] |  |  |  |
Net Sales, Percentage | 16.20% | 29.20% | 14.80% | 23.00%

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration