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Balance Sheet Components (Details) (USD $)
 3 Months Ended 12 Months Ended
Aug. 31, 2012
May 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Inventories            
Raw materials $ 2,999,000   $ 3,450,000 $ 2,999,000 $ 3,450,000  
Work in process 4,065,000   3,287,000 4,065,000 3,287,000  
Finished goods 5,952,000   9,480,000 5,952,000 9,480,000  
Total 13,016,000   16,217,000 13,016,000 16,217,000  
Inventory write-down 800,000 700,000 4,300,000 3,148,000 5,793,000 40,000
Property, Plant and Equipment            
Total property, plant and equipment 86,706,000   77,011,000 86,706,000 77,011,000  
Less: Accumulated depreciation, amortization and impairment (40,064,000)   (25,207,000) (40,064,000) (25,207,000)  
Property, plant and equipment, net 46,642,000   51,804,000 46,642,000 51,804,000  
Property, plant and equipment pledged as collateral for notes payable and lines of credit 9,900,000   12,800,000 9,900,000 12,800,000  
Impairment of Long-Lived Assets            
Impairment of long-lived assets 7,500,000     7,507,000    
Buildings and improvements
            
Property, Plant and Equipment            
Total property, plant and equipment 14,501,000   12,924,000 14,501,000 12,924,000  
Machinery and equipment
            
Property, Plant and Equipment            
Total property, plant and equipment 64,267,000   50,669,000 64,267,000 50,669,000  
Leasehold improvements
            
Property, Plant and Equipment            
Total property, plant and equipment 3,143,000   3,123,000 3,143,000 3,123,000  
Other equipment
            
Property, Plant and Equipment            
Total property, plant and equipment 2,249,000   2,136,000 2,249,000 2,136,000  
Construction in progress
            
Property, Plant and Equipment            
Total property, plant and equipment $ 2,546,000   $ 8,159,000 $ 2,546,000 $ 8,159,000