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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Aug. 31, 2012
Summary of Significant Accounting Policies  
Cash, cash equivalents and Short-term Investments by location

 

Cash, Cash Equivalents and Short-term Investments by Location
  August 31,
2012 		  August 31,
2011 		 

United States;

              

Denominated in U.S. dollars

   $ 18,744   $ 75,348  

Taiwan;

              

Denominated in U.S. dollars

     34,477     3,382  

Denominated in New Taiwan dollars

     2,193     4,669  

Denominated in other currencies

     235     119  

China (including Hong Kong);

              

Denominated in U.S. dollars

     376     100  

Denominated in Renminbi

     33     —  

Denominated in H.K. dollars

     1     1  
           

Total cash, cash equivalents and short-term investments

   $ 56,059   $ 83,619  
           

        
Concentration of Credit Risk  
Schedule of cash and cash equivalents by location

 

Cash and Cash Equivalents
  August 31,
2012 		  August 31,
2011 		 

Cash;

              

Cash and demand deposits

   $ 36,218   $ 76,619  

Cash equivalents;

              

Time deposits

     6,000     —  

Certificates of deposits

     —     2,000  

Money market funds

     5,010     5,000  
           

Total cash and cash equivalents

   $ 47,228   $ 83,619  
           

        
Schedule of estimated useful lives of property, plant and equipment

 

 

Buildings and improvements

   5 to 20 years

Machinery and equipment

   2 to 10 years

Leasehold improvements

   1 to 10 years

Other equipment

   2 to 6 years

        
Schedule of estimated useful lives of finite-lived intangible assets

 

 

Patents and trademarks

   3 to 25 years

Acquired technology

   4 years

Customer relationships

   5 years

        
Accounts receivable | Customer concentration risk
  
Concentration of Credit Risk  
Schedule of customers accounting for 10% or more

 

Customers
  August 31,
2012 		  August 31,
2011 		 

Customer A

     15 %   —  

Customer B

     11 %   10 %

Customer C

     —     15 %
Revenues | Customer concentration risk
  
Concentration of Credit Risk  
Schedule of customers accounting for 10% or more

 

 
   Years Ended August 31,  
 
   2012   2011   2010  
Customers
  Amount   % of
Revenues 		  Amount   % of
Revenues 		  Amount   % of
Revenues 		 

Customer A

   $ 7,176     24 % $ —     —   $ —     —  

Customer B

   $ 764     3 % $ 1,993     6 % $ 6,955     20 %

Customer C

   $ 8     0 % $ 3,936     12 % $ 2,012     6 %