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Investments in Unconsolidated Entities (Details 2) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2012
May 31, 2013
Aug. 31, 2013
Cost Method Investments      
Impairment loss on investment   $ 1,885,000 $ 1,885,000
High Power Optoelectronics
     
Cost Method Investments      
Percentage of cost method investee owned 9.90%    
Investment of equity interest 2,900,000    
Period within which the entity can exercise option to increase equity interest 1 year    
Impairment loss on investment   $ 1,900,000 $ 1,885,000
High Power Optoelectronics | Minimum
     
Cost Method Investments      
Option to increase equity interest (as a percent) 50.00%