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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended																3 Months Ended
	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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Represents information pertaining to the carrying value of cash, cash equivalents and marketable securities.

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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

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-Section 50

-Paragraph 21

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-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

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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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