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Balance Sheet Components (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Nov. 30, 2012
Inventories    
Raw materials $ 2,999 $ 2,808
Work in process 4,065 3,618
Finished goods 5,952 5,285
Total 13,016 11,711
Property, Plant and Equipment    
Total property, plant and equipment 86,706 89,462
Less: Accumulated depreciation, amortization and impairment (40,064) (43,250)
Property, plant and equipment, net 46,642 46,212
Impairment of Long-Lived Assets    
Impairment of long-lived assets 7,507  
Buildings and improvements
    
Property, Plant and Equipment    
Total property, plant and equipment 14,501 14,940
Machinery and equipment
    
Property, Plant and Equipment    
Total property, plant and equipment 64,267 66,543
Leasehold improvements
    
Property, Plant and Equipment    
Total property, plant and equipment 3,143 3,238
Other equipment
    
Property, Plant and Equipment    
Total property, plant and equipment 2,249 2,243
Construction in progress
    
Property, Plant and Equipment    
Total property, plant and equipment $ 2,546 $ 2,498