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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended
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Nov. 30, 2012 | Aug. 31, 2012 | Nov. 30, 2012 Revenues Customer concentration risk Top ten customers | Nov. 30, 2011 Revenues Customer concentration risk Top ten customers | Nov. 30, 2012 United States U.S. Dollars | Aug. 31, 2012 United States U.S. Dollars | Nov. 30, 2012 Taiwan U.S. Dollars | Aug. 31, 2012 Taiwan U.S. Dollars | Nov. 30, 2012 Taiwan New Taiwan Dollars | Aug. 31, 2012 Taiwan New Taiwan Dollars | Nov. 30, 2012 Taiwan Other currencies | Aug. 31, 2012 Taiwan Other currencies | Nov. 30, 2012 China (including Hong Kong) U.S. Dollars | Aug. 31, 2012 China (including Hong Kong) U.S. Dollars | Nov. 30, 2012 China (including Hong Kong) Renminbi | Aug. 31, 2012 China (including Hong Kong) Renminbi | Nov. 30, 2012 China (including Hong Kong) H.K. dollars | Aug. 31, 2012 China (including Hong Kong) H.K. dollars | Nov. 30, 2012 China, Taiwan, Russia and the United States Revenues Customer concentration risk | Nov. 30, 2011 China, Taiwan, Russia and the United States Revenues Customer concentration risk
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents and short-term investments | $ 47,663 | $ 56,059 |  |  | $ 18,700 | $ 18,744 | $ 26,641 | $ 34,477 | $ 1,485 | $ 2,193 | $ 208 | $ 235 | $ 376 | $ 376 | $ 252 | $ 33 | $ 1 | $ 1 |  |
Concentration risk (as a percent) |  |  | 47.00% | 58.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.00% | 86.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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