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Investments in Unconsolidated Entities (Details 2) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended
Feb. 28, 2014
Aug. 31, 2013
Oct. 31, 2012
High Power Optoelectronics
Aug. 31, 2013
High Power Optoelectronics
Oct. 31, 2012
High Power Optoelectronics
Minimum
Cost Method Investments          
Percentage of cost method investee owned     9.90%    
Investment of equity interest $ 1,971 $ 1,986 $ 2,900    
Option to increase equity interest (as a percent)         50.00%
Period within which the entity can exercise option to increase equity interest     1 year    
Impairment loss on investment       $ 1,885