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Summary of Significant Accounting Policies (Details 4) | 12 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011
Patents and trademarks |  |
Intangible Assets |  |
Estimated useful lives | 17 years | 17 years
Patents and trademarks | Minimum |  |
Intangible Assets |  |
Estimated useful lives | 3 years |
Patents and trademarks | Maximum |  |
Intangible Assets |  |
Estimated useful lives | 25 years |
Acquired technology |  |
Intangible Assets |  |
Estimated useful lives | 4 years | 4 years
Customer relationships |  |
Intangible Assets |  |
Estimated useful lives | 5 years | 5 years

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

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration